Unauthorized debit

I checked my account today and noticed that a debit was made on my account on the 1st and was posted on the 3rd. I do not know who did this but I never went to this website until today to find out what it was about. I did not use this website to look up ancestors or anything else. My account was charged $9.97. It's only $10 but I work hard for that. Please check on this and debit my card back the $10 please. I will go to the bank tomorrow to file a complaint.