cel c failed to cancell my contract

Hi there, i had a 24 month data contract with cell c wich expired last year Feb 2015, i have tried many times to cancell as per the contract that should i not wish to upgrade, i can cancell. Everytime i call to cancell i am being forwarded to a cancelling consultant but wil hold more than 30 min until their line cut my call. They have been deducting my money and i dont use their data. i cancel with the bank but they keep deducting. <br> Please help me sort this out with this dishonest company.