Customer service needs improvement

The device stopped working within 12 hours after collecting from the dealership. I had to call their call centre twice to ask them to fix it, they said they would call me back and they didn’t. On the third time, I threatened to cancel my contract then later that day an email was sent. I’m incredibly dissatisfied with the level of customer service offered. No one had answers with regards to when I would be called to arrange for them to view. To receive such horrific service when cars are being ****** everyday is appalling, especially because I’m the one that noticed that their unit wasn’t working.