Faulty device

The DQ unit on both vehicles was installed in May. The DQ unit on one of our vehicles has been faulty ever since. We have tried endless times to get a tech to assess and fix the unit. Yesterday a tech was supposed to come out but did not. Whats even more annoying is my husband gets some notifications and I dont and vise versa. I am the policy holder. We are paying for a service on a faulty device. Since the unit is faulty, if anything happens to our vehicles we will hold Discovery Insure responsible. We want a tech to come this Saturday at 11 at our premises to sort out the faulty unit and test and make sure both units are working else we will be canceling our policy and moving to another insurance!