MTN the worst cellular performer a multitude of times

Once again despite proactive input from myself MTN has still not changed the account details. I have been trying with this exercise since April or even earlier of this year. Now July and once again it is not removed. So the only alternative is I am going to cancel the debit order and wait for their legal department and accounts to get excited when they do not receive payment. Maybe then they will get off their backsides. people should be fired