CONTRACT STILL NOT CANCELLLED

I'm still waiting since i logged a complain lasr week but my matter hasnt been resloved. Who must i contact to get this sorted cause i've had enough. 3 months after my contract expired you are still billing me. Which agreement did i sign to say i want to continue or renew the contract??? If you can show me that i will gladly pay but as far as i know i signed a cancellation form. You keep sending me data i never signed up for and will not pay for. Please my contract expired 3 months ago and i want my account to be closed urgently.