Just pay back my refund of R250

On the 30th I logged a claim for refund, I bought a voucher and didn't receive voucher pin, On the 20th it was discovered that due to the incompetency of their staff the wrong voucher was sent for refund which was redeemd , the correct one was logged then and I was told 3-5day for my refund, we are on the 24th today and I find out that still the wrong voucher was escalated on e again, I just want my damn refund so I can cancel my account with the bank and find a more trusted one at that