Direct Debit stopped leading to account suspension

I have had once again another terrible experience with MTN, 2nd time for this year alone.<br> <br> I have been with them for 6 years and have never had an issue with payment, 3 months ago my direct was somehow cancelled, all my direct debits go off on the same day. I have a contract with vodacom as well and their payment still gets taken as per normal yet my MTN Debit stopped all of a sudden, when I called them they hung up non me a few times and the last person wouldn't allow me to speak to the supervisor or somebody higher up and told me I should contact my bank. I asked them to reinstate my account so that I can contact my bank but they refused, after been with them for so long this is the type of service that I receive from my telecommunications company which I find disgusting.