Billing MESS

I have been trying to resolve a billing issue that I have. It's clear that Vodacom, when trusted with a debit order simply abuse this privileged and bill whatever they feel like. I have the following reference number: ***.. This number was sent to me on 07 April in an email promising that i would be contacted in 24 hours. To date I have not been contacted. I have also tried to call Vodacom. Yesterday I spoke to a lady who had no idea what she was talking about and tried to shout over me with irrelevant figures and Vodacom policies. After spending 29 minutes on the phone with her she then told me that she was not the right person to speak to (what kind of joke is that)? I no longer trust Vodacom's billing system and i will be moving to a more transparent month to month provider. I would like a manager to please call me. Somebody who understands the billing process and debit and credit. I do not like receiving NUMEROUS pre recorded calls from Vodacom threatening to cut me off. I have had a debit order for over 2 years without any trouble. Thanks