Double charged

I placed an order at the barceloes in Ballito on the 18/12/18 for a thumbs up pack and extra tub of sauce which came to R158. When I initially did a payment I was told by the cashier that it did not go through due to signal issues and she then processed the sale again once it went through I noticed 2 sms's from my bank for the payment going through, I showed this to the cashier and she assured me that a reversal would be done within 48hrs I had no issue with this and left the store. On the 19th there was no reversal done so I contacted the barceloes to inform them that it was not yet sorted and was again told to wait 48hrs. I again waited and there was no reversal I received a call again from 1 of the managers and was told an audit from the bank was being done and I would be contacted the next day I again wait and I am not contacted by anyone until late afternoon. I again was told that another investigation was being done and was requested again to wait for feedback I again waited only to receive another call to inform me that the back office lady would have to look into it and she is only back on Monday 24/12/18 and was offered a R90 car wash for inconvenience (I don't drive). Today yet again I relieve a call to say another investigation will be done and they are not sure when a reversal will be done, I obviously was ****ed off as I don't expect a refund to take a week. We are regular customers of barceloes and I am utterly appuled at the customer service it is a continuous run around with no one being able to provide answers. I sent through Bank statements with the double payment and was told they cannot find the payment. It has been the absolute worst experience with a restaurant I have never had an experience like this before for a simple refund.