Confused and not happy!!

I just wanted to clear up and ask something... Is it the client's duty to inform you that they have wronfully deducted money of my bank account every time the hire contract expires? (I have rep**** to the email sent to me a month prior to the contract being expired) This is the second time now that it has happened to me. We pay for debit orders to go off our accounts!! Who manages these things? What scares me the most is, if we don't phone to tell you guys, will you keep on deducting money from our bank accounts even after the 36 month contract has expired? Come on people, it's not my or any other clients' job to tell you guys this everytime. Surely you must have a system in place that prevent these kind of things? I am not a happy client right now!