MTN -Worst Service!!!

MTN service totally sucks!!! its my second experience with the network. they blatantly ignored my instruction to cancel my contract and renewed it without my consent and knowledge furthermore had me listed and damaged my credit record for not receiving payment on an account which I was not aware of ( was not accepted or known to me). I had no communication whatsoever. I found out when I was declined an application elsewhere! I went in numerous times to their stores, emailed numerous departments and employees, I called so many times asking for help,i emailed proof to so many people and it all reached a dead end. I received no feedback uptil today , I was promised a clearance letter and proof that they would remove the negative listing on ITC but I have received nothing to date! they have damaged my credit record and are doing nothing to rectify it.