Account Suspension - Absolutely PATHETIC service

This is the third month in a row that MTN suspends my account due to "Non Payment" without warning, However Payment is made before the 30th of each month. Each time I have to phone 135 to make a so called "payment arrangement" to get my account activated again, and then need to wait anything between 2 and 24 Hours before I am able yo use my phone again. The excuse I keep on receiving from the agent on the line, is that MTN upgraded there systems, and that is why my account keeps on getting suspended. Going to an MTN shop is also useless to get the problem resolved, as the Consultants only refer me to phone the Customer Service Center, as there is nothing that they can do from there end in the Shop.