Don't ever enter into a contract with Vodacom!!!!!!

I cancelled my data contract by paying the early cancellation fee in April 2018. In September 2018 a debit order came off my account. Now 7 or 8 phone calls later I am still waiting for a refund. Promises of emails and phone calls for this to happen have not materialised. No one will provide an email address so that any complaints can be properly dealt with. One gets referred from Customer Care, to Cancellations, to Accounts and back again and no one can give a consistent answer and they refuse to talk to each other. The story is repeated on every occasion and then the "assistants" refuse to actually assist and tell you not to shout and to calm down and then hang up on you! In October 2018 a further debit order came off my account which I managed to reverse at the bank but am still waiting for a refund from September. Perhaps someone from Vodacom can contact me through this forum so that I can get resolution finally or even an email address will help? I'm at my wits end