Demand my refund now

I am a customer at FNB for my business and personal. I have 3 vehicles financed with wesbank. There is no wesbank branch that I can visit to complain so I use FNB internal phone to call wesbank. In June the 6 I settled 1 vehicle and followed all the rules on settlement and agreements. The day after settling the vehicle an installment was taken. Wesbank acknowledges that a refund will be paid to me. I have made 6 phone calls to wesbank about the refund. Only to told that the matter will be a escalated. The refund was paid into a wrong account number which nobody knows. My last call to wesbank I was told to contact my FNB banker who will assist. I did contact my banker who said he is unable to assist. It seems like I just gave away R5200 to wesbank or FNB and the story ends. It is my money. I am demanding from wesbank. But who cares. All the calls gets dropped. And the banks send you from Pillar to post. Times are tough and the bank just doesn’t care. If it were the other way around I would have been threatened