Safe Cart Advance Tech Support Called and wanted to get into my PC after I purchased a year ago, they put a virus in my PC a year ago. I had to go to the Geek Squad to get my PC repaired

I was contacted by Safe Cart Advance Technical Support that they were affiliated with Microsoft and they could clean and tune up my pc, this was in August of 2014, and like a dummy I said yes and they signed me up for a three year support of $539.97; they wouldn't be able to work on the PC until I signed up.  All done remotely.  Well they added things on it and took off things I didn't want taken off.  Then later my computer started not working correctly, so since my companion had Geek Squad for his computer support I asked them to look at it. They did a remote check and told me I had a virus and had to take the computer to them so get it repaired as it takes a lot of time to do that.

I had forgotten about them, until today they called me Advance tech support wanting to get into my PC, asked if I remembered purchased the support, which I hadn't. Told him to give me a refund and he said it wasn't his fault and told me when I could make sense to give them a call.  He asked me why I paid that amount if I wasn't going to use it. To tell you the thruth I had forgotten all about it. I told him it was a dumb mistake on my part, a lesson learned the hard way.  So it is a lesson learned the hard way. When I see the name SAFE CART, it scares me a I stay clear of it.