Acura of Seattle

I was in the Acura of Seattle dealership today inquiring about the audi a4 they had. The salesperson took me on a test drive and I really liked the car a lot. When it came down to the price we negotiated and finally agreed on a price with some added extra's that needed to happen per the 75,000 mile maintenance on the car. I signed the "proposal" for the deal which was apparently already approved by the manager. The rep went away after I signed and was on the phone for a while. When he came back he said he misinterpreted the manager and that he was saying yes to someone else...and then said my deal could not work because they could not complete any of the maintenance needed. They then tried to sell me just the car at the same price we agreed on without the extras which at that point I said no and walked out. If you make an offer for something, you need to stand by it. I was fully ready to purchase the car at that price. I was even told the car had been on the lot for a while but apparently you didn't need to get rid of it as bad as you said.