Complaint Review: Fox rent-a-car (TAMPA AIRPORT)

Fox rent-a-car refuses to return my deposit without cause. I paid all tolls with cash and have receipts for every one of them, and I cleaned the car and filled the tank before returning it.  The receipt sent by e-mail upon return contains charges that do not match the rental agreement, and  provides no information regarding my deposit or in any way indicates the $150 deposit as a separate and refundable charge. The pre-purchase contract obtained online several weeks in advance did not  require an additional deposit, nor did any of the paperwork provided throught that venue indicate a deposit would later be required. However, when I picked up the vehicle for use, the charge to my account was raised to include a deposit. The customer service agent assured me it would be returned when I dropped off the car.  The deposit has not been returned and when I called to inquire why, I was told to go to the rental office in person to resolve my issue, although it is clear by the paperwork and my identification that I live in another State. I have continued to attempt resolution by phone, but I am repeatedly put on hold and/or when transfered the connection gets cut off. The few times I have been successful with speaking to a customer service representative, each of the individuals I spoke with cannot access the same information that is reflected in the documents provided to me, and refuse to provide contact infromation for their supervisors.