Avis car rental Deceptive charges and advertising Houston Texas

 This past Mother's Day weekend I drove my car from Grapevine, Tx to Houston to visit my parents. My car overheated right outside of Houston and I had to rent a car to get back home while my car was being repaired. I opted for the least expensive car ( subcompact), less than $30/day and had to accept a hefty drop off fee since I wasn't bringing it back to the same location. This was all secured online. The bill came out to just under $100 for one day rental. When I decided to extend my stay and keep the car two more days, the final bill came out to almost $300. My complaints with the desk help and a supervisor with their customer service dept. Fell on deaf ears citing that my rate was a contractual agreement and that it couldn't be changed. I would not recommend Avis to anyone under any circumstances....I would rather use public transportation before I would consider using them again.