Can an ISP really detect this?

The ISP can see all data your systems exchange with the internet (but not the plain text from encrypted data). Based on this he can detect botnets which often show typical behavior.

Should I action on this and what to do?

Yes, you should action on this since there seems to be malware in your network which is used to disturb other systems on the internet (sending spam mails, DDoS attacks, used as VPN to hide malicious activity and others) and which might also affect your internal network (infect computers, steal data, take data as ransom ...).

If you don't fix the problem you might also risk that the ISP restricts your network or even completely disconnects you from the internet (depending on the terms of service).

Based on the information you've provided it is impossible to say what exactly the problem is though. It might be that your laptop is infected (Antivirus do not offer 100% protection) or that one of your phones or that the router itself. It might also be other devices in your network you are not really aware of, like a TV, printer, IP camera or other IoT devices. And it might be also caused by software you have knowingly installed yourself, but which has a hidden malicious functionality you are now aware of.

The links they provided in the mail seem to be fine so that you can follow these for more information and for the offered botnet removal tool. But if you are in doubt if the mail really originated by your ISP please contact the ISP - it is impossible for us to see based on the information provided what the real origin of the mail is.

Can an ISP really detect this?

The ISP can see all data your systems exchange with the internet (but not the plain text from encrypted data). Based on this he can detect botnets which often show typical behavior.

Should I action on this and what to do?

Yes, you should action on this since there seems to be malware in your network which is used to disturb other systems on the internet (sending spam mails, DDoS attacks, used as VPN to hide malicious activity and others) and which might also affect your internal network (infect computers, steal data, take data as ransom ...).

If you don't fix the problem you might also risk that the ISP restricts your network or even completely disconnects you from the internet (depending on the terms of service).

Based on the information you've provided it is impossible to say what exactly the problem is though. It might be that your laptop is infected (Antivirus do not offer 100% protection) or that one of your phones or that the router itself. It might also be other devices in your network you are not really aware of, like a TV, printer, IP camera or other IoT devices. And it might be also caused by software you have knowingly installed yourself, but which has a hidden malicious functionality you are not aware of.

The links they provided in the mail seem to be fine so that you can follow these for more information and for the offered botnet removal tool. But if you are in doubt if the mail really originated by your ISP please contact the ISP - it is impossible for us to see based on the information provided what the real origin of the mail is.

Can an ISP really detect this?

The ISP can see all data your systems exchange with the internet (but not the plain text from encrypted data). Based on this he can detect botnets which often show typical behavior.

Should I action on this and what to do?

Yes, you should action on this since there seems to be malware in your network which is used to disturb other systems on the internet (sending spam mails, DDoS attacks, used as VPN to hide malicious activity and others) and which might also affect your internal network (infect computers, steal data, take data as ransom ...).

If you don't fix the problem you might also risk that the ISP restricts your network or even completely disconnects you from the internet (depending on the terms of service).

Based on the information you've provided it is impossible to say what exactly the problem is though. It might be that your laptop is infected (Antivirus do not offer 100% protection) or that one of your phones or that the router itself. It might also be other devices you are not really aware of, like a TV, printer, IP camera or other IoT devices.

The links they provided in the mail seem to be fine so that you can follow these for more information and for the offered botnet removal tool. But if you are in doubt if the mail really originated by your ISP please contact the ISP - it is impossible for us to see based on the information provided what the real origin of the mail is.

Can an ISP really detect this?

The ISP can see all data your systems exchange with the internet (but not the plain text from encrypted data). Based on this he can detect botnets which often show typical behavior.

Should I action on this and what to do?

Yes, you should action on this since there seems to be malware in your network which is used to disturb other systems on the internet (sending spam mails, DDoS attacks, used as VPN to hide malicious activity and others) and which might also affect your internal network (infect computers, steal data, take data as ransom ...).

If you don't fix the problem you might also risk that the ISP restricts your network or even completely disconnects you from the internet (depending on the terms of service).

Based on the information you've provided it is impossible to say what exactly the problem is though. It might be that your laptop is infected (Antivirus do not offer 100% protection) or that one of your phones or that the router itself. It might also be other devices in your network you are not really aware of, like a TV, printer, IP camera or other IoT devices. And it might be also caused by software you have knowingly installed yourself, but which has a hidden malicious functionality you are now aware of.

The links they provided in the mail seem to be fine so that you can follow these for more information and for the offered botnet removal tool. But if you are in doubt if the mail really originated by your ISP please contact the ISP - it is impossible for us to see based on the information provided what the real origin of the mail is.