Dollar Rental Car - Switch & Bait?

Beware! Never, ever book your car rental with Dollar Car Rental!! They scammed me into paying more for my rental by telling me the vehicle I reserve was NOT available (as we were driving out of the lot, we saw a few vehicles that we originally reserved!) and offered us another - The agent claimed that the daily rate on the alternate vehicle was a lot cheaper than what we originally reserved, and said I would be getting a very good deal. So we took it. However, they didn't make it verbally clear that the cheaper rate was actually a daily upgrade fee IN ADDITION to what I already had paid in advance.

When I returned the vehicle 5 days later, I ended up paying an additional $$$$ more than I should have!! For an error on their part for not giving me what I reserved in the first place!!! DOLLAR SUCKS!! I'm never doing business with them again and you shouldn't either if you don't want to incur any unnecessary add'l charges!!!