Lack of feedback

I logged a query with Vodacom for a ********** contract that is being deducted from my account. I was supposed to get feedback on Monday the 15th but no one has called me. When I call the contact centre I am told there is no number I can call I must just send an email. I sent an email and no one is still coming back to me. I am planning to reverse my debit order for all the contracts I have until this issue has been sorted.