Line Suspended Again at MTN

I've upgraded my phone contract in November 2015.<br> I've been a customer of MTN for around 20 years.<br> Ever since my upgrade, my phone line gets suspended every month-end.<br> I've called every month, and then the line gets re-instated.<br> In December, I was told that my \credit limit\" has been reached and that is the reason for suspension.<br> I've requested that the limit be increased - Mpho confirmed that this was done.<br> Only to have my line suspended again this month.<br> I called the customer service line and was told to contact Credit dept - I Cant' BECAUSE MY LINE IS SUSPENDED!<br> I phoned customer care again and Leratho assisted me telephonically and had me on hold for 11 minutes trying to put me through to her team leader.<br> I phoned again and spoke to Marlize who confirmed that the limit was never increased.<br> How do I get this mess sorted out? The bill gets paid every month, but still the line gets suspended.<br> This is terrible service - how must one run your business from a line that is forever suspended?"