Poor Customer Service

I had placed an order online at Steers William Nicol in Johannesburg my order number is ***6 and when placing this order I used a voucher coder in which they refer to it as a "WiCode" and I was going to pay the difference cash once my order arrives. The voucher code is ***. I have called through to the store and they advised that there was nothing they could do. I then called through to the customer services line and requested to speak to the manager, the manager then reassured me that he had escalated the matter and even called me back to say that he escalated the matter. I still have not received any feedback from them. Its been over 2 weeks now that I have been running around about this matter. I mean how difficult can it be to just reactivate a voucher code. You know Steers was one of my favorite takeout places but now I will definitely not buy there ever again not that, that will make any difference to them. I just want them to refund me back actually if that is possible and they don't even need to reactivate that code because I don't want anything from Steers. Can this matter please just be resolved, I am tired of wasting my airtime and time in dealing with *********** people.