Shocking Service Virgin Mobile

I had initially taken a cellphone contract with Virgin Mobile. However, the telephone never worked once! I was always told that there are technical aspects that Virgin was correcting but it was never worked! I never once used that number because it did not work. This can be verified on their system. I tried numerous times to cancel this contract but virgin Mobile kept debiting my account. Eventually at the beginning of the month I reversed this debit order and instructed my bank to not allow Virgin Mobile to debit bank account. Now I receive a call from debt collectors informing me that my account has been handed over to debt collection! I owe Virgin Mobile nothing! No service was provided and I tried on numerous occasions to cancel this account. Furthermore, Virgin mobile did not even inform me that they believed that money was outstanding! I told this to the debt collector, who also agreed that this was not my fault! Why should I pay for a service that was never rendered and I had tried to cancel on so many occasions. This is ********* behaviour by Virgin Mobile! I want it rectified immediately.