Nedbank poor service!!!!

Nedbank double debited me on my home loan because tbey failed to end or cancel the debit order. I noticed the debits on my account and contacted Nedbank which we confirmed Nedbank had debited my account in error. It has now been a week and they still have not reversed/refunded my funds. I have to continuously call and follow up with very little feedback when my refunds will happen as they have still have not processed my refund correctly putting me in a difficult financial position! I keep being transfered to at least 3 consultants per call I amke all asking for the same verification details from me ***, name, address, ***. Its crazy actually. Quick to take your money without warning in error but now my headache to try and get the refund!