MTN Sucks as usual

I have been phoning numerous times since December as they made an error with my Invoice of November instead of my usual invoce of R2500 the invoive was for over R4000. On the advise of one of the call center agents i paid the bill and phoned the call center back to have the Invoice adjusted. Till today no results!!!! MTN is quick to take your money but giving it back due to an error on their side is a whole mountain of problems on its own!!! the service is non existent and you get the generic answer of "it has been escalated to a supervisor" with no results!!! it can not take 2 months to have this sorted!!!!!