Been paying premium for 2 months for a non working alarm

In Nov 2017 I app**** to install the alarm with ADT armed response. The alarm was installed and I paid the registration fee which was inclusive of the monthly premium. The technician came to active the alarm in Nov but indicated that she failed to activate it because it's faulty or something like that. I called and e-mailed the company on numerous occasions without any success. It was in Jan when another technician was sent to activate the alarm and confirmed that indeed it was not working. I called the company back to complain that I have been paying for 2 months for the alarm that was not working. They kept on telling me to call their numbers to speak to the relevant person but everyone was transferring me from one person to another.