Amex Credit Card Complaint

Amex Credit card department,

Identity theft / Fraud / Embezzlement Mississippi

I used my credit card with - yesterday. I was scammed. They got into my computer and locked it up. I called the no. on the computer and they said I had viruses on my computer and I had been hacked my foreign countries. Said they were the only ones that could fix it. Dumb me, fell for it to the tune of $290.00. -. is what is showing up on my credit card, but I was talking to someone who said they were - -, tele # -. I researched them, and they are definitely a scam company. Hope they have not ruined my computer. I need your help.