Refund delays and poor customer service

MFC debited my account twice on Saturday, when I called in to report and request that the second payment be reversed they told me it'd be done on Monday. Monday I called in I was told to it'd be done on Tuesday and Tuesday I called in I was yet again sent around. What was supposed to have been an easy transaction is now being dragged for days and it's very frustrating. I thought that because ei bank with Nedbank everything would be seamless but to my dismay it's just stressful.