Poor Service from National Security & Fire

I have been experiencing absolute poor service from this company since they installed the alarm system almost 4 months ago!! I have spoken to their Agents/ Supervisors/ Technicians etc, and had the system changed and reset numerous times, but giving same problems. I am going to now escalate this to the Cosumer Protector as there is non-response from this company. I have since also cancelled my contract with them, but they continue to bill me, to which I also reversed the debit orders for the cancellation of contract, and I'll keep doing so as I belief that they should in fact pay me back for a defective system installed since day one!! I even refered them to their contract TCC's Ref #10.2- "Quality of Goods". They just DON'T care!!!