Disappointed customer

I have been trying to resolve an ongoing dispute regarding and upgrade and the amount I am being charged. Based on the information I have been told I would only pay for my new device and data and not continue paying the previous device which was upgraded. Let me clarify I called Vodacom and did an upgrade, I asked what I would pay and was given a figure of about R680.00 based on what I signed up for, no one told me I would continue to pay for the previous contract.

On 27 November 2019 I called vodacom logged a dispute after being put from pillar to post for over an hour. I got a reference number and I was told I would be contacted in 7 days as someone would need to listen to the call then give me feedback and I also asked to be sent the call.

I was told some from escalations would contact me and give me feedback. Today I call to follow up and I am told my query has been resolved and the call was sent to the dealership, to my surprise as I did not even speak to anyone. Once more I ask to speak to the manager of Grace Montane(agent) who after 20 minutes told me there was only one manager on the floor and they would have to call me back, I am still waiting for that call. My query has not been resolved and no one has bothered to contact me.