Unauthorised card transaction

I really have so far enjoyed the service I have been receiving from UBER, so it's disappointing that I have to experience this frustration. On Sunday, 27/08/2017, I requested an UBER from Pretoria to Johannesburg and the trip was R527.00. I then cancelled the request as I made another means of transport. I noticed 2 days later that the hold on my FNB card has still not been voided/reversed , and logged a query with UBER. They then advised that they will void the hold so that my bank can credit the money back into my account , but should give 5-7 days for all this to happen. It's been over 7 days today, and they have now referred me back to my bank. FNB has confirmed that they have not voided the transaction and can't do nothing about it till UBER has processed the reversal on their side. I just need my money back and I don't think UBER is willing to give it back. I am really tired of these back and forth emails with UBER.