Complaint Review: Auto Marketing Systems

I was contacted Friday morning by a Matt Carter saying they had some buyers for my car as it was listed on craigslist, which is already a violation of craigslist TOS.  I called back and asked for Matt, who was unavailable, and was told by a lady that they had 4 people looking for my 2006 Nissan Sentra Special Edition and 6 others just looking for a Sentra.  Being half awake, I agreed and never heard back from them.  Granted, its only been 4 days, but I have not received any confirmation email nor have I gotten any calls or inquiries towards my car.  I called them this morning to ask for my money back, to which I was told the $99 package is non-refundable.  I stated the thousands of pages about it online all refer to a scam, which I was told theyve been in business way too long to be a scam.  Do your homework on this company before agreeing to anything, unlike me!