Withholding CC deposit, no invoice, no customer se

I hired a car from the Cape Town Airport Branch on Wed 16/09/2015. The car was returned the same day. After countless fruitless emails to the customer service (or lack thereof) channels, I have yet to receive an invoice for the transaction. The holding deposit on my credit card has not been released, and customer services bounce you from one person to another. Poor service, and very bad lag time, in an industry that should be on point and prompt with dealing with customers. I won't be using Dollar Thrifty again as this is the second bad experience I've had with them. Would not recommend this company either.