Not a happy customer

All our company vehicles is fitted with Matrix tracking devices for the past 3 months two of our vehicles have been had rhe problem where it wouldnt start. We have had the batteries tested and the alternators and no fault eventualy did the test to find out that the tracking devices are still drawing power from the battery even when the car is switched off ... called matrix about the problem and they are not helpful at all !!! I need to take my car to a dealer to sort out ??? Ive called 4 dealerships and no one at the dealerships have an idea what im talking about ? So my problem is these are company vehicles so should i find a dealer that can help we do not have time for 2 vehicles to stand at a dealership until someone can sort this out and secondly i dont feel that its something we have to pay for since it should be after service from matrix ? Why can you not just send someone to come and have a look at the units batteries and just replace it ? Please thisnis becoming a big issue now ? And does that mean that all the other vechicles are going to have the same problem soon as the 2 giving problems now was the first ones that were installed ! Can someone give me a call and help me sort this out URGENTLY !!!