Poor Service

In June tracker devices were installed in 2 vehicles requested. In early July I randomly requested positions on the vehicles. They got back to me after over an hour with location. I overlooked it, as they said they had, a problem with satellite. For 3 weeks in September the tracker hasn't been working or updating on location. They 1st told me to uninstall tracker app & then reinstall as they had a problem with the app. I tried that it didn't work. No1 got back to me as requested, I had to make numerous calls n hold the line fr long periods of time before the fleet department either took my call or cut my call... Which was very annoying. After several days they said both the device were faulty & had to be replaced. The technician came out on Sunday 19/09/2021. Only to find out on Monday that the 1 device was stil not working. They could not give me an exact reason as to why the device was not working. My question is. If a new device was supposedly installed why should I be having a problem. They are very unprofessional & their customer service is very lousy.