Poor service!

I am so frustrated with MTN at the moment, My account payments has not been allocated by MTn for the past 6 months although i have sent them through numerous times via MTN Welkom, I cannot log into my account on the internet because everything has been blocked and my account states closed! I have queried lots of times but have had no luck thus far, please sort my account out and unlock my account status before i will be suspended AGAIN! Or cancel my contract!