That is a scam. That scam has been going around for a few months using various company names, but all the same action. Pay money and allow remote access to your computer where they install software, which can now compromise your information and security.
At this point you should get an external hard drive if you do not have one, backup your hard drive, then erase the internal drive and reinstall Mac OS X (the procedure depends on which Mac OS X you have). Then very carefully restore the backed up applications and data - care must be taken to not return the software that was planted to your hard drive.