Maybe the 8,100,00 was the down payment. Now that I read the story again there could have been an error in the writing of the contract and the customer is trying to take advantage of that. Still,the BBB says hundreds of complaints. Personally I HATE the crap you have to go through when you buy a new/used car from a dealership.
I bought a new car this year from a local dealer known - in some circles - as the 911 dealer. Why? Cause it's been said the dealership is so high pressure, that some poor slobs felt threatened if they left without buying, so they called 911 on their cell phone for help.
I had a wonderful experience. I work in dealer finance for a bank, so I knew what I was doing.
The salesman - on the other hand - knew nothing at all. He was a newbie. Never ever had sold a car before. It made no difference to me since I knew what I wanted. After a few minutes of negotiation, I was dealing with the sales manager as he walked the newbie through the steps.
But if you even show the slightest fear or doubt in the sales process, they circle you like sharks.