Two days ago, I received a call from someone claiming to be from Intel Corporation stating that my IP address may be insecure, and I dumbly let him Remote Access my Windows 8.1(I think) Tablet (Automatically connects to Wi-Fi).
I'm not sure what they did, but I grew suspicious, around 10-30 minutes later, so I turned off the tablet, and evaded their calls (person isn't here right now, call back later, etc); though I did turn it on again to factory reset it, which I think allowed them access to the tablet again since it locked while I was in the middle of doing that; was able to, but haven't use it since, because I'll have to reconnect it to the Wi-Fi -- don't have access to the security key, since I'm not in charge of it, but it's a home network, and can connect by press the switch on the router.
While it was going on, I noticed them doing some stuff, like pinging 32 bytes every sec (command prompt, to an 18.104.22.168, which seems to be a public DNS from google) and checking the performance of the computer (task manager), making/changing the network (noticed the name was changed from my connection name to my computer name), and downloading some stuff(Not positive on the name): UltraViewer, something named Router, and maybe others -- When I researched on this, I happened upon ARP poisoning, which I suspect they did to perform man-in-the-middle.
Can anyone help me with this issue? Reason being, my network admin said they'll check the network but hasn't, and stated he doesn't know what to do when I inquired about my research.
Ps. I don't use the Windows tablet for anything besides browsing the internet (Read web novels & comics, searching for stuff, etc)
PS2. Not sure if it's a home network, but when I checked on a laptop, it seems to be.