Hardrock Cafe Johannesburg - Refund

I cannot explain how disappointed I am at the service I have received at Hardrock Cafe Johannesburg thus far regarding my refund. After paying for my bill on Saturday night, my waitress told me that the swipe machine had no signal and made me swipe again to pay for my bill. I realised that this had in fact gone through twice and whilst I was still at the restaurant brought this to an employee's attention who took my details and said I will be contacted back regarding my refund. However, my details were taken and I was not contacted. On Monday I contacted the Bookkeeper informing him of my situation. On Tuesday I followed up and was told that the Bookkeeper was in meetings. On Wednesday, the Bookkeeper requested evidence that this has in fact gone through twice. I forwarded this statement from my bank clearly showing proof. I received a call from the Bookkeeper on Wednesday afternoon who asked questions such as have I not given my sister my card to swipe etc. I was also quoted the incorrect bill of items that I have not even ordered? Every excuse was given not to refund me. I am still awaiting feedback and my refund. This is appalling service,I definitely will not visit them again.