MTN Service is beyond pathetic

I have been a loyal MTN customer from day one. I upgraded my package on the 01st of March 2015 and MTN never loaded the new package resulting in me receiving accounts 3 to 4 times what they should be. I have queried this with the 19 times which included 4 visits to 4 different branches. The last visit was to Forest Hill Branch where something was done but once again not done properly. Today they cut my line again and when I contacted they I was put on hold 3 times with the shortest being 35 minutes. The reason that I was cut according to them is I have reached my cap of R7200 which was changed to R1000 when I upgraded my package. I have now run out of options so will need to seek legal assistance. MTN are quick to cut your line but you never hear from them when they owe you money.