Do you get it in writing?

The BBB is making General Motors trade my 2006 Pontiac G6 because it is a lemon. I ordered my car at my local dealership, Heritage Pontiac in Terrell, Texas. My car was to cost under 25000.00 but as time goes on the dealer informs me that he is raising the price to almost 28,000.00. He apparently can do this because he never put in writing what the cost was to be. I now drive a Dodge! Never ever trust a dealer who only runs his mouth and not his pen!!! Please learn from my mistake.