Cant cancle my cotract that ended 3 months ago!

<p>I took out a Cell C contract 2 years & 3 months ago for my daughter and the contract ended 3 months ago and cant get in touch with anyone at Cell C to cancle the contract, meantime they are still biling me every month for the line rental as we chnaged her service provider at the end of the contract as it was costing to much.</p> <p>This contract has clearly not been cancled and has now amounted to over R1500!! and climbing, Unberlievable this is now going to effect my good credit rating all I want is for this contract to be canceled and where I owe them nothing as we have not used this number since it ended. </p>