MTN is the pits!!!

Seems once you have upgraded, that's when you stop becoming a valued MTN customer... i upgraded at the beginning of the month and was told i can dail *141*5# to adjust my call limits, which i did. I have now discovered my handset has been blocked, so have obviously reached my limit. Now i cannot readjust!! When i dial the Call Centre a automation tells me that the number i have entered does not exist! I am sure it will re-exist when they want payment... I have even tried the option 2 to speak to someone about MTN's new services and products and i just get cut off.. nice Marketing! No positive response to mails and no direct contact..really??? So frustrated right now!!!