Vodacom bad Customer Service

I have been a Vodacom customer for years, I’m very disappointed that I have been asking for refund on my contract due to over payments on my side. Contract ended Im now no month to month. I never changed the amount to sim only. I realized the error when I have already paid R3900 extra. I logged a request 13 June to date I have not received my money. I’m pushed from pillar to post every week there is a new reason why my request has not been processed. Last week I was told money will be in my account 20 August, today when I called they they waiting for pop and confirmation of bank account. All that was sent to them 3 times already and also to one of the supervisors direct email. I am really disappointed and I’m at the point where I have lost hope that I will ever get my money.