Security Cameras Systems

I recently had new windows put up in my home and all sensors are working fine except one. I actually relocated it to a different part of the house since one of the windows is just a fixed non opening window. How can I reset this sensor? The problem is causing me to leave the alarm unarmed everyday for about 2 weeks now. It is a Digital Security Controls sensor, which is a company owned by Tyco, which owns ADT. I am thinking about calling ADT for maintenance but that means atleast 115 US$. Any help would be appreciated. Thanks.

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My contract for the ADT home wireless system is ending soon thankfully. Their product works fine but their customer service is horrible and there’s no alarm response unless you pay hundreds extra. I’ve already called ADT Burnaby telling them not to renew.
IS THERE SOMETHING MORE I SHOULD DO to ensure ADT doesn’t send me another $460 bill for another year of monitoring?
ALSO and more importantly, I signed this contract after confirming that I would be able to buy this system once the contract expired or before. In small print, the contract says ADT retains ownership but last year I got a price of $599 (they told me to pay for it next year and the price will be lower) and this year, the employees are confused. They won’t answer the price question. They transfer me to faraway ADT centers that can’t help. I’m currently waiting for a call from the Escalation Desk. ???
HAS ANYONE BEEN IN THIS SITUATION BEFORE OR HAVE ADVICE? I don’t want the system removed from my walls.