Bad service

I had an awkward experience with myway in connection with Avis, I payed 1500 deposit for car hire and now they are refusing to pay it back, I was speaking to the lady by the name of Nomfanelo Ngwenya which is a claims car hire from myway she is also failing to assist. She requested transactions taken by Avis, which I did they took R1500 for deposit, R146 which was supposed to be taken off from the deposit and they have taken R340 which i do know what is it for, why would they debit the money from the account without our authority. I've requested Nomfanenelo to prove that they payed the money as they claim, till date I've never heard from her the last time I've send her an email it was on the 5th