MTN Shocking service!

what a disappointment in your service, I have had my account with you for more than 10 years, originally on a debit order, but then 1 month you get clever and bill me R8000 on my capped data line, that NO ONE could sort out or find the fault, I still have all the references numbers, not one person at head office level could sort this out, so I was forced to pay this bill. Since then I have paid my account via eft monthly, no problem until now!! Suddenly my CURRENT bill is in arrears, and needs to be paid before I can upgrade a line, what a load of *******!!! But yet again to avoid the frustration with *********** staff and endless arguments with people who actually have no clue, or just cut you off when apparently transferring your call, I paid the bill. And STILL the upgrade is blocked!! What shocking service. But in saying that, Thank you to Kerry Heath from the MTN Jacqueline Mall branch who has tried, but again head office staff totally ***********!!!