Being misled by vodacom agent

I'm not happy with the manner vodacom is ill treating me. My problem is vodacom misled me by saying that they are giving me a cellphone as a present for being a loyal customer, only to find out at a later stage that it was an upgrade. I asked the agent several times that vodacom is not going to add anything on my bill and he said no, it is a gift. To my surprise towards the 15th I saw my bill was up, and I called vodacom customer service and they were adamant that I upgraded the number. Then the following day they called to say they coming to collect the cellphone and i told them to give me time as the cellphone i Borrowed to my mother and she in centurion. So they said if the phone is not handed, then they are continuing as an upgrade. I refused that i never consented to an upgrade, as i was given a phone as a gift. Since then no one is willing to assist me, they telling me about the cancelation fee. Since then I'm being given a run around and I'm also told that they don't have the details of the person who was helping with the upgrade. Please help me with resolving this issue, I was misled by vodacom. I cannot afford the extra +R200 that is added on my account and I'm now frustrated to a point where I'm thinking of stopping paying that account because I cannot afford. Ticket reference-EC-1TJ3-2NNFH5