Rude Consultant and unfair practise

I've spoken to your trade help desk, explain my situation to the consultant and informed her that I will not be billed because Cell C failed to cancel the contract. She cancel the contract and put it on prepaid. She informed me that I will get billed, while I was still speaking to her she dropped the phone down in my ear. Your consultant is very rude and I need action to be taken against her. I spoke to her today(03/02/2016) at about 10:20. I handed the phone with everything to your store on the 29th of January 2016, I've cancel the contract because of s network problem, how can I get billed for a phone I don't have and I emailed Cell C and informed them not to load MB and minutes but they loaded it. I can't pay for the error that Cell C has done<br> <br> Will wait to hear from you regarding the reported matter and I will not get billed for a account that Cell C failed to cancel after I've done everything from my side. If I get billed then I will report the matter to the National Consumer Commission.