Poorest cusomer service!!!

I was approved for a loan.I contacted STD Bank to confirm the settlement balance which I paid via EFT in Sept 2014. That was my very last payment & no further deductions came off my account then. I was contacted about 6 months later & informed I owed an amount of R500.00 I couldn't understand why I owed them money as I had paid up the loan. I went to the Vincent branch who contacted their loan department and I was put through from one person to the next until I was cut off. STD bank then deducted money from my account on a monthly basis adding close to R100. I received a call this year in March to advise I owed an amount of R1660. The funds they were deducting monthly from my account was not for the 'outstanding' amount of R500 but their \Service Fee\"! I went to STD Bank again and saw the branch manager Nicholas Saunders as I would like to resolve this once & for all. I explained the situation to him. He did not only make me feel stupid but he has yet to assist me in resolving this matter. I am frustrated that after all this time & all my efforts this matter is still not resolved. I'm extremely unhappy with the way I have been treated and would never recommend STD bank to anyone."