sick and tired of fighting

I am truly sick and tired of having to use these means to defend myself. I have been a loyal paying Customer with MTN for many years. This relates to 3 of my contracts with MTN. One of the contracts ended on the 17th of Nov 2015 and ever since then MTN refused to close that account although I gave 30days notice before that date. Then for the first time ever my debit order for Dec didn't go through. I eventually went and paid the amount due and was told everything is back to normal. BUT then all hell broke loose. Our numbers were disconnected 3 times and when I inquired I was told that another amount was in arrears. I have been phoning and emailing ever since and get cut off and nothing gets done. Today I got an sms that R 2090.00 will be debited in Jan. With the remaining 2 Numbers it is supposed to be R 691.00 MAX! By now MTN has received R 101,365.04 from me over the past years. Is this how they treat a loyal Customer? I consider it as ***** to keep billing me for a contract that is supposed to be closed. And it is ********* to cut of lines after I went and paid up all outstanding amounts. Next the Ombudsman and ICASA.