Unsatisfied response

I year ago I joined cartrack fleet tracking system for 2 cars and their technician came install the tracking system on both vehicles but ended disturbing the passenger seat airbag control system,which I continuously called them to come fix it but they continuously failed to show up as till today they have not fixed the issue. During this continuous wait for them to fix what malfunctioned I decided to withhold their monthly premiums until they fix the issue but they I failed to come to the party as much as that I no longer have 2 cars but I am left with the car that has a fault. So they kept quiet until this month they start calling for me to pay the premiums but they have not called to fix the car default, they are in a rush to get their premiums but not in a rush to fix their problem's.