Bad Service

I have been a loyal customer for many years. I pay my account on time and every other month my account gets suspended because mtn can't get their payments and accounts correct. I call to sort out the problem only to be made out to be the one in the wrong. I get spoken to badly. Then once they reconnect me in order for me to send my proof of payment which I pay in advance they fail to do that. I have to call again to go through the same process over again. I am disgusted in the service I received and the fact that I pay on time and have to be treated like I have not paid and have no right to open my phone line. I am forced to make a payment arrangement otherwise they completely refuse to help me. I am so grateful that cell c has the buy out plan I can't wait to get out my contracts. I am done with mtn. I have now sent through my proof of payment twice and have asked them to confirm they have it and still have had not a response ,except for the 4 sms telling me to pay my account and they will suspend my phone. I am furious that this is an on going problem with this company. They even charge me late payment fees! *****ing money from me!