Poor customer service

I need to expose Standard bank with their less than desirable way they deal with their clients. I have Revolving credit loan. I increased my limit in 2011 and have been paying ever since. I had someone from their RCP division call me in 2016 and was told that I was given the incorrect instalment amount in 2011 and would have to increase my monthly payment to urgently reduce the loan I requested she investigate and get back to me, needless to say I have not heard back from her. At this point I investigated and found that I was paying R200.00 less than my interest and still owe them more than the initial amount...8 years later...impossible. I have requested a copy of the agreement from Kenilworth branch in 2017 (have not received any feedback or the agreement) to prove it was their error and they need to resolve it without them reflecting the blame to me . I called the call centre on 06/08/2018 and spoke to Jamiel Frazenburg who guaranteed management will get back to me...no one called or sent a mail. I then called on 10/08/2018 and spoke to Panalo Raditla who advised she is waiting on feedback from Cecilia Manyadzwa (Department Manager). I am appalled that I have been a loyal customer for 20 years and even more taken aback by the fact there no one can give me immediate answers and no one understands what has gone wrong. Shame on you Standard Bank.