Nedbank Greenbacks

On 6 July I made some purchases on my Greenbacks Shop card which had a credit on after saving my Greenbacks for a year. I returned some of the items the next day which were then credited back to my by the 2 retailers in question. TO DATE Nedbank has not credited the one amount of R 250 back to me - in fact - they claim I spent the R250 first (which is not the case - it was a credit given to me by the retailer) and then it was credited back - in essence making it a 0 credit. I have phoned 3 times and each time my call took about 30 minutes to explain the problem to the call centre agents - the last one promised me the issue would be resolved by 25 August - no surprise - it has not. I am getting really upset as this is a \benefit"I pay for - I have been a client of Nedbank since 1999 but the past year's bad service as well as this incident now has me seriously considering moving my banking elsewhere."""