Unfortunately I have required the ESTA (The Electronic System for Travel Authorization) on a non-official website, which ask me a very high fee, with respect to the official website where it costs only 14$. I have immediately wrote the this website asking to cancel my request and refund me. Surprizing they did it, I got a refund.
Now my point is: what about the data I have gave to them. It seems to me that these people what to cheat people, so I am worried about what they are going to use with my data, including personal data and credit card (including cvv). Should I be worried? Is there anything I can do?