New Banking Details not captured - Vodacom process flawed

I have been unsuccessful in getting my debit order details changed which has led my account to go into arrears and the number being suspended. I have made multiple calls and emails sent including visiting the branch where they couldn't help. The call centre seems to not be willing to help also. During this period my phone was ****** and I am unable to do a sim swop. I have now been told to call MBD to which was done and arrangements made as its no error on my part. I am told my sim will not be activated until the arrears is paid in 3 months time but I need to continue paying my instalment without being able to use my phone? It doesn't make sense. I need this to be escalated as again its not my fault that my bank details were not changed for the debit to go. How do I pay for something I cant use nor can I get a swim swop?