Bad / no service from Head Office

Been trying to upgrade my phone now for the last month. As MTN is striking there is just nobody that even bothers trying to assist customers or even the in-store consultant that is trying on ones behalf. They have changed my payment method from debit order to collection (who knows why!!) and now I cannot upgrade although the debit order still goes through monthly. The store consultant is trying her best to assist but not getting any joy either from head office. I can't even cancel my contract (which I am really considering at this moment) as it has to be done through head office. <br> I have been trying to phone but alas. Having the irritating MTN jingle in my ear for 20min does nothing for my frustration levels. Please help!!