Cancelation

I was canceling my phone with them due to bad network coverage at my work it's has been costing me money! So I can cancel but I have a choice to pay for the phone I have with 7 months left on my contract I still have to pay R4200 In to keep it so I said no they can keep the phone now they say there is a assessment period on the phone that can take up to 7 days and to get them to cancel it might take a another day so I can't sit with out a phone as I use it for work so they expect me to go pay like R2000 for a phone I can send emails and use proper internet on while they busy assessing the phone and to cancel the phone before I can port my number to a different contract at another provider I phoned the call center no help at all tried the Facebook only asked for a ref number never heard from again I refuse to pay them I will remove all my money out of my acc till this is sorted