Unauthorized Debit!!! Refund my money!!

I called cc last week to get unauthorized debit reversed. Was told to fill form online and it would be done within 24hrs. This was on the 30th April! I don’t have time to go to the bank! That’s why I do all my transactions online!!!! I’ve contacted Avis (logged complaint here too but they don’t respond) and still no one can tell me why they debited R5514 from my account!!! I want that debit reversed immediately!! I have the debit reversal request ref, no one from Nedbank has called me!