Deposit never paid back, money banked

Our vehicle went in for repairs and Outsurance advised that Avis has a rental vehicle available at Roodepoort branch. 12 February 2016 a payment was made for the deposit & the vehicle returned on the 19th of February 2016. When returning the vehicle the female advised that the deposit will be returned within 48 hours. On 24 February 2016 i contacted customer service and was told that the request to return the money was never processed however this was done and that i can expect a refund within 48 hours. 11 March 2016 I contacted the customer service center and was advised that the money was deposited and I should contact my bank and find out why it is not reflecting. Contacted my banker, no funds were deposited for clearing. Contacted the customer service on the 14 March 2016 and was assisted by Ebrahim and was told that the money was banked by avis and will launch an investigation and receive feedback within 7 working days. I have been sent from pillar to post and expect feedback by no later by COB Wednesday 30 March 2016 failing which will result a complaint with SAVRALA on your poor service and theft.