incorrect Settlement amount,Bad service!

I was handed over by MTN ,I've made payments using MTN's acc and reference,I explained this to one of ssda's agents,he then sent me an update outstanding balance which Was correct cause it was corresponding with the one I got from mtn,later on I was handed over to another company who also gave me the same settlement amount,I could not make payments yet,so I was handed over back to ssda,the lady I spoke to (Palesa/Lehlogonolo) then gave me an incorrect settlement amount,it seems as if my balance has not been updated,I would like to settle my account now but I cant because no one is willing to give me an updated balance from MTN.I have tried sending emails and calling them But the consultants are very rude,I have tried asking to speak to a team leader but my call was dropped,I would like to settle my account ASAP but I want to get a correct settlement amount from MTN