Advanced Tech Service supposedly fixed problems interactively on my computer, installed a Pandz Security and may have used my cred card # illegally Nationwide

I was in need of computer program repairs. I contacted them from computer advertisement on the internet. First time there was in improvment but then I had problems again--and had been told to call back if need be and they would fix it. Cost $249.00. and repair was worse but they said they would offer me a good deal on Panda security since my computer had a conflict with my antivirus and cost was 250.00 for lifetime Panda security.I had a serious virus attack and called and this was how they said to solve it. There was another charge of 49.95 also. This OCT 28, 2014 and on Oct.29 there was charges of 200.00 dollars for games prurchase on my card that I did not buy. I called my card company and as far as I know they are still investigating this--but they gave me credit and issued me new cards. I think someone from this agency used my card--but I cannot prove it . I began to be concerned when I tried to call them to cancle the Panda protection because I had to pay someone else--in person to come and fix all the problems they created on my computer. I tried several days and called 11/20/2014 just to see if I would be able to talk to some about gettin a refund  for all of this. That is when the message told me what to do.