I took out a R1500 loan, over a 6 month period with African bank

I took out a R1500 loan, over a 6 month period with African bank. I paid R1763,13, before 1st payment was due.I called about settlement letter and was that I had to pay R1920 in total, I then paid a further R156,87.spoke to a consultant,who told me I still needed to pay R11,94, which I did.I was told settlememt shows R69,78. A day later it was R70,29.I told her I cant pay, because there is a zero balance. She then asked me to eft,I did.. The R71 is reflecting as a minus,I called the bank again and was told it is not overpaid and cant get a settlement letter, until it is finalised. I asked how much more I have to pay,after a month,taking into account I borrowed R1500.She told me she'll put in closure request,which will take 72hours, which means I can incur further cost