I rented from Alamo at SAT back in October of 2006. When I returned my car, the gas level was fine but the person checking it in said it wasn't. I fought with the person for a few moments but he wouldn't budge and I had a flight to catch.

So, I got back home and sent the BBB a compliant along with a very recent gas receipt copy and my rental receipt to prove the times were close enough that I wouldn't have burned that much gas in a few minutes.

Alamo returned about $35 to me about 2 weeks later and a letter explaining they were sorry. The BBB is always a possible solution if talking to customer care doesn't work - that's what they are partly there for.