Malfunctioning unit

I call cartrack on 28 February telling them that the unit is not working, they said they will reboot it and I must close my app and open it after 30 minutes. I did what they say I must do and the following day I call them to notify them that it's still not working. They then said they are trying to test it while I'm holding. They said the unit is not working and they are booking it for repairs. Since then, today is 17th March, no calls nothing. When you call them they take you from pillars to post. Pathetic service. The car carries important goods everyday and it needs to be monitored every second. When I want to cancel, they said they will still debit my account because the account is still active, how can you debit account while you nor offering services. Pathetic.