Refund owed to us as well as solving a problem

I took out a personal loan with Standard Bank 4 years ago. In December 2014 I wanted to settle my account after paying every week for the passed 4 years. Shortly after doing so,I received a call from the bank saying I was in arrears of R40000..which was impossibleI went into the bank after they phoned me again a few days later and said I was R80000 in arrears.They checked on the system and showed me what happened..on the statement you can se that I in fact paid off the account, I didn't owe a sent.BUT they had a IT problem.They kept adding R20000 in SERVICE FEES to my account every few days.Eventually the total was over R180000 which they expected me to pay off. We kept receiving different reference numbers, kept logging calls and nothing happened.Finally end of January we had had enough and informed the bank we would be taking further steps.All of a sudden,before the end of the day it was sorted.After having to hassle them every day,we received the paperwork a few days later.Now, another two weeks later,I am still waiting for a refund they owe me after I paid too much as they were too *********** to tell me what the balance was.I have had enough, further steps will be taken today!