Cancellation of a contract cell phone

In 2012 May I went to report my contract cell phone which got lost and I was assisted by the store manager Kevin. I completed forms and went to a police station to do an affidavit then submitted to the insurance. He then told me to wait for a week. I never got a call I kept on going to the store to do follow ups and there was nothing happening. Every month they were debiting on my account but I had no phone. I went and laid a complain to him that I want to cancel my contract with cell c.He sent an email for Cancellation and told me that Matshidiso is handling it and it's been cancelled and he wants me to pay for the remaining 2 months left. I asked him to explain the months that they were debiting knowing that I was awaiting to receive a phone from them I had no phone at that time. He promised to get back to her and will let me know. he never did that I waited again still there was no phone no response from her about the debit order that was going through to them every month since from May 2012 when reported the phone to Feb 2013 when I received it. Now Cell c sent me a msg that I owe them R2800. I called Kevin today to check on their system,he tells me that their system crushed.