Deposit Refund

I'm very disappointed with Avis, I collected a rental Car on 22nd of July through my insurance, I paid R2000 deposit upon collection, I returned the Car on the 6th of Aug they said my deposit will be paid back in 72 hours but till now nothing, I called yesterday the consultant said it has been paid it will reflect today, but it didn't when I called again a lady called Nonhlanhla tells a different story saying its still with their finance department its still in the process of being paid. I will never rent with Avis again I have never experienced this level of unprofessionalism. Europcar is the best no delays with deposits