Still debiting for expired contract

I took up a contract 3 years back and they are still billing me for this. The contract was never renewed or anything. And that cell phone hasn't been active or in use for over a year but they are still billing me. I have sent them emails but no response from them till today.<br> <br> I need them to refund me all the monies debited as in today and I do not need any contract with them.<br> <br> <br> Not a happy customer. And should they wish to contact me, please email.