Bad problem resulution at branch and head office

On the 5th of August I went to Edgars West Street to pay my full outstanding balance on my account of R1 192.56. So I swiped R1000 rand and paid the other money using cash, however the cashier blacked the computer and said the transaction was going to reverse itself, days went by the R1000 wasn't reversed. I then printed a statement and went to the branch (I spoke to Ashween) and showed him that the money has not reversed of which he promised to sort it out. Upon further investigations done by Edgars head office they can see the money on their side but it was not reflecting on my account. Months went by and my account kept on accumulating interest even though I had paid on my side. After being charged interest even after the account was paid for the R1000 issue was only solved late December by Edwin. Unfortunately by the time the matter was sorted my account had accumulated so much interest and is now in arrears that resulted in my funeral policy lapsing in September. This has caused so much headache for me as it had made my name bad on the credit bureau. I have requested that I wish to close this account after they had sorted out this issue but now I am being told I have to pay interest charged on an overdue account of which the fault wasn't even mine. I am so frustrated and want this problem solved as soon as possible, I also want nothing to do with the Edcon group as they have brought nothing but problems into my life. I had to go up and down to the bank printing bank statements at my cost because I had to come with a new one every now and then, I have been paying for documents to be scanned and emailed to the head office and I have been going to the store wasting my petrol and yet I am still being told to pay plus minus R500