MTN Customer Service Sucks

I have had countless issues with MTN, to the extent that I have nearly been on the brink of a breakdown, because you can not get anyone to assist you successfully. I have been suspended once again for a roaming charge that I feel was unjust. After an incident in 2011/2012 when I got a R4000 roaming bill, which I paid in FULL, I informed MTN to never ever allow roaming on my account again! I was in Moz in December and I had NO roaming, great they got something right. 4 months later I am in Thailand and on my return home get suspended for a roaming bill. How is this possible? On top of this they also started charging insurance which I never agreed to, I have been with MTN for 20 years and all of a sudden I need insurance????? I am still waiting for this refund. I have sent in excess of 20 emails and made just as many phone calls and still I sit sucking the hind tit. I call this ******ion, because I must pay first or get suspended. I AM SO UPSET, can someone please help me sort this out.