Poor service from Tracker

I reported my unit not working 8 month back without it being repair. I phoned them again about 4 month back to report it again. I tried to speak to a manager but according to the person answering the phone, she will decide if I can told to a manager. I stopped my debit order as I felt someone will phone me if they see my debit order did not went off. My premium is now a few months behind, I received a notice of suspension from them and stating that I owe them the money. I phoned Tracker again on Friday to speak to a manager, still no success.

I can not see how Tracker expect me to pay for a service not render.