Failure to Refund

In July, I paid off my car, sent proof of payment, nothing was done until I called to ask for papers, which was done in August after calling them several times. The account was finally closed, but I erroneously paid money via EFT to the closed account on the 3rd September, I immediately went to the branch to request reversal, I was told to wait for 3 days until it reflected,which I did, a week later I called the asset and vehicle finance to ask what had been done, was told about procedures and the money would be reimbursed by the 1st October, I waited by the 3rd, I called again just to check if something was done, I was given another one of their silly excuses, I called on the 8th October, was told money would be in my account today the 10th, a few minutes ago check my account there was no money, I called again, now I'm told the matter has been escalated and money to be reimbursed by the 13th, what the hell.... this is one of the most useless banks I had to deal with in my life, if they fail to do right, let them close shop, unlike this poor sserviice they are offering, what the hell are they still operting for. Sies!!!?