SOMEONE PLEASE.??? BAD SERVICE CAN'T BE THIS ACCEPTABLE???

I have never experienced this level of service from MTN branches, Call Centre's and ABOVE ALL THE ACCOUNTS DEPARTMENT!! My phone was ****** 14th April 2021. I reported my phone ****** and requested a sim swop from the MTN Garden Route Mall only to be told that they won't help me as my account's current balance is showing R698. Let me just mention that by the time reported the invoices for the next payment before the 7th of the next month was the current due. My Account has been blocked every two weeks since November 2020. Calling the call Centre became my least favorite fortnight activity. The excuse you ask??? We switched to a new system and the accounts department is struggling to allocate past payments. Please send the proof of payment for Jul 2020 outstanding. Next week: Okay July is sorted but you are blocked as August 2020 shows a payment outstanding. Please send the POP for the line to be unlocked. 2 weeks later it was September and so on and so forth. This only seemed to be cleared up by April just in time for me to request a simswop and be denied for outstanding payments of October 2020. Which proof of payments have been sent to individuals at the call center and the account departments and even handed in to Wendy at the garden route store. "Sorry sweety. I won't help you. Pay your account, which shows an outstanding amount of f*kng 0 because the Account department placed the block on a system for f*king August 2020 f*king payment. I've been escalating this matter every few weeks and no resolve. I've paid for my contract for 4 months without being able to use it because of the issue. HOW IS SERVICE LIKE THIS ACCEPTABLE??? CAN SOMEONE HELP ME WITH THE KNOWLEDGE AND POWER IN MTN TO SORT IT OUT???? PLEASE....