Account suspended for no reason/Terrible Service!!

Oh my soul!!! My phone got suspended on Saturday for NO apparent reason, my account has always been up to date. Went into the MTN shop for assistance, waited for half an hour while they were busy with the same clients while 4 more people waited in the row in front of me. Went in later, only to be told that the they could not assist me, they can see my account is up to date but I need to phone their customer care line and they are already closed. Have been on hold for more than half an hour only to be told that I have reached my billing limit for my account which will be billed on the 1st of June?? What about my 100 minutes that reset on the 1st of May??? And I need to speak to the credit department to increase my limit. Another 30 wasted minutes. This is the worse service I have ever received, had I known this I would have changed over to one of the other service providers when Nashua Mobile closed down. Never had this problem with them!!!!