mercedes benz usa spent $3602 got nothing montvale, New Jersey

This has to be up there with the largest deceptive business practice of all time.......I bought an E class Mercedes in April 2008.  I got the "hard sell" about adding an extended limited warranty (ELW) and I took the deal, paying $3602, as I was told that if I didn't get it on the day of purchase, the price of the warranty would be considerably more expensive if purchased later.  The car had a 4 year factory warranty which would have expired in April 2012 at which time the extended warranty would have begun. 

In 2010, I suffered a catastrophic health event and as I was not able to drive the car, my husband traded in on a vehicle that he wanted (not a Mercedes).  In December 2010 when I contacted the dealer to apply for the refund of the  ELW purchase price, they referred me to Mercedes Benz USA.  After being told by several customer service reps at Mercedes Benz USA Corporate HQs in Montvale, New Jersey  (these reps, incidentally are not permitted to give their surnames) that they would check on the status of my refund, I received a callback from one of the reps who told me that the "product" I had purchased was only refundable only within 60 days of the purchase date of the vehicle and warranty, or 3 years and 10 months prior to the expiration of the factory warranty!  I repeatedly asked Mercedes Benz to provide a copy the properly executed contract and have not received it.  What reasonable person would believe that a refund of $3602 would be denied when absolutely no service or benefit was provided.  Is Mercedes Benz in such financial straits that they have to keep $3605 of a customer's money?  How many other customers have "contributed" to the profit of Mercedes Benz?  Is Mercedes Benz still offering this "product" and have they offered it prior to 2008?  Does this mean that any Mercedes customer who is stupid enough to believe that Mercedes is an honorable company gets ripped off if they have to get rid of their vehicle before the extended warranty goes into effect?  Why won't they produce a copy of the properly executed contact?