NetStar draing my battery???

I have had a NetStar tracker in my Toyota Hilux since 2008. It worked fine for 10years. I could park my vehicle (at Lanseria Airport) fly to Cape Town, regularly check, and return 2 weeks later and my car would start, no problem. In 2022, they upgraded/replaced my existing tracker, and since then, if I don't drive my car for at least 1 hour in a day, my car won't start. I have contacted NetStar and they have replaced the tracker 2/3 times, to no avail. The technician, just looking at the battery, initially said, there was a dead cell in the battery??? I have consequently also spent R7k + investigating whether there is any other component perhaps causing the drain.