Bad customer service and faulty device installed

they install faulty devices that don't work, so those devices don't track your car movement only your stationery location. their technician came in and also damaged my car's interiors and didnt say anything about that, the issue was reported and no one is boring to attend to the issue, all they say is our people will call you within 48 hours but it been 2 weeks, I wouldnt recommend anyone to take a contract with this guys because they will ruin your life