Extremely Bad Service & Incorrectly Billed

I have logged a complaint with MTN every month now. I am being incorrectly billed. I need my account sorted out. I logged a complaint on Hello Peter on 06 Nov, feedback from MTN said they will sort it out, its not!!! Just last month they had to fix it again, now i noticed that the problem persists!!! I think the month of July and Aug was fixed last. Now Sept and Oct and NOVEMBER is wrong AGAIN!!! :-( I can no longer deal with MTN, because they never get back to me and don't fix my account. Something is wrong on their system. I need a manager to contact me or their director and have my account fixed once and for all. I am supposed to receive 500MB of data included in my package deal. On my account they charge me R 92.11 for this, they are not supposed to, it should be discounted with this amount but its NOT happening!!! :-( every month i have to go through the same PAIN all over again!!! i cant take it anymore!!! i have even told them that if this is not fixed permanently i will contact my bank and stop the debit order to go off my account. I will be contacting my bank today. Please help i am so fed up with MTN. I cannot believe that my problem still hasn't been resolved!OMG!