If you paid the $799 on top of the advertised price, you got got. And the thing of it is, I'm sure the vast majority of people don't do their homework, and don't realize that this is the law, so the majority of stealerships do constantly get away with it.
Assume the car is $20,000. If they want to charge a "doc fee" of $799, then the price of the car on the paperwork had better be $19,201.
You will never, ever win with a car dealership. Ever. They do this dance 10 or 15 times a day, you do it maybe once every 5 years, maybe. It's like playing Chess with a Grandmaster: you don't stand a chance, so just do your research and try to hold on as best as you can.
What is the maximum amount a car dealer can charge in "doc fees"? reads in part:
"The Georgia Attorney General Office’s position is that only government fees such as tax, title, tag and Lemon Law fees may be excluded from advertised vehicle prices. Any other amounts of money that the dealership collects as part of the sale – including, but not limited to, dealer fees and previously installed dealer options – must be included in the advertised price. ... Failure to include a non-government fee in an advertised price is considered an unfair or deceptive practice, and therefore a violation of Georgia law."