Mrp mobile

I took a cell phone contract with them 2 years ago and it lapsed but they are still deducting money from my account. I called them to inquire why they were deducting money from me, they are telling me that I should write to them and inform them that the contract has ended and they must cancel it. By the way this is the first time they are telling me this. I don't even know what that money is for. I'm frustrated.