Repayment of Deposit

I rented out a Toyota Hilux on the 31th of November, 2015. I was instructed that if I return the car after 5pm, which was close of business on Saturdays, the security guard would be present to perform the post inspection of the vehicle and on Monday I would receive my deposit (R5000 less cost of hire of R292) back. However to date I have not received my money back and I have been transferred back and forth by the AVIS team, with each member refusing responsibility and suggesting I need to contact my bank for my deposit to return, whereas the debit was effected to their account by their staff. <br> <br> What also puzzles me about this suggestion that the funds are with my bank, how then have they received revenue payment for the rental since the only debit I have is the R5000.