I am billed for something that i don't have

Last year December 13/12/2014 i upgraded my contract with cell c on cell number ***, a week later i returned the phone ( Sumsung G355 core 2 white dual) as it wasn't functioning correctly. I requested the contract be cancelled which the sales consultant was happy to do right there and then... to my disappointment the debit order has still been deducted off my account at the end of the month and has been for the past 9 months. <br> <br> I have been communicating and phoning head office every other day about this but nothing has been done! <br> <br> I am paying for something that i don't have!!!! i wold like a complete refund of this i am fed up with asking and asking. The contract number is *** DON'T PHONE ME IF YOU DON'T HAVE A SOLUTION TO THIS PROBLEM!!!!<br> <br> <br> NICO HERBST<br> ***