Billed for a package without consent

I was called by Cell C direct. The lady on the line offered me a ZTE Blade V6 device with 3gigs anytime data for R249 per month. It sounded too good to be true getting a device and 3gigs data at that price. I kept asking if she is sure and correct about this offer and she insisted it is and is only available from Cell C direct. I weren't even aware of this mobile brand and the data offer is what caught my interest so i agreed to take up the contract. The lady did a follow up call on the delivery day and i enquired again if it's anytime data and she insisted it is but i only noticed on my second debit order to cell c that i was being over charged R323 per month and when i checked my statement i was allocated 1gig daytime data. Now I'm tied to a package i never agree upon. I have made numerous attempts to get this rectified and all attempts failed. I even went to the Durban office. Duane and Buhle reviewed the recordings for themselves which verified my story. I was told head office will be in contact to rectify this. Then Natasha contacted me and tried to sell me a different data offer instead of resolving the problem. I'll have to get CPA involved soon to be taken seriously.