Review Paying for techical assistance and call out fee for rented system

I have a rented system which is giving me technical problems and i have to pay a call out fee. Rented means it doesn't belong to me, so why should i pay for its repairs. I have an alarm system that doesn't work and i must still pay for the monthly installation. Being with ADT hasnt been smooth since day1. I want to cancel this horrible service.I think i should inform my family and friends how adt really works.