Unfairly Billed

Towards the end of January 2014 I was hijacked around Springs where my contract IPhone was also taken. I then reported this at Cell C Secunda and asked for it to be blacklisted I asked for a new phone but was told I can only get it under a new contract. I waited for an upgrade period then took a new contract and requested that the IPhone contract be cancelled when it end together with the data contract which I also had. I was told this was done. Recently I noticed that my bill is too high when investigating at Cell C Secunda they told me that my other contracts are still running even after they expired with me not even have the IPhone. When enquiring I was referred to Cell C customer Services who told me no notice was recorded for cancellation of the other 2 contracts hence am charged for those services. They claim the store made a mistake and should have given me a reference when closing/cancelling those contracts. They told me they cannot assist me I must talk to the branch and the branch referred me back to the customer service and in the meantime am being billed every month. Is this the good service or am being **********. Please assist me to sort this one once and for all.