I want my deposit back!

I hired a group T car on the 18th of December 2015 and returned the car on the 22nd of December 2015. I paid a deposit of R3000 for the car which I was told would be returned to me within a week. It has been 2 months now and there is still no sign of my deposit. When I call the East London office I get sent from pillar to post and now they are telling me there is no record of me ever hiring a car with them. I mean what the hell? What is going on with Thrifty? Why do you people have ***** tendencies?