Given the runaround with Wesbank refund

I had vehicle finance with Wesbank before my car was written off and paid off last year August. The account was closed. In April as I was applying for finance for a new car I got notified that the closed account with Wesbank had a positive balance, Wesbank has never informed me of this. I submitted the required proof of payment and banking details for a refund to be processed and I was informed that the refund would be processed in 5-7 working days. Thus duration has passed. I've been calling Wesbank to find out what the delay is and they keep telling me the matter has been escalated. The last call I received from Wesbank was that I should wait another 48-72 hours for them to find out why there's a delay and what the problem could be. Only after that will my refund be processed. I've been waiting in the dark for long enough now and I need my refund today!