Poor service and faulty devices

Poor service, on the trucking devices and always at fault, were else I'm paying every month for the devices that are not working. I have made several attempts asking them to send technician to come help me and up to so far nothing. It's been while since from last year,and am talking about big fleet of vehicles in this case,but monthly premiums are taken from my account. As a result I lost income and business because of this issue,and still not fixed.