Runaround when they need to pay the no covery warranty

We have a fleet under this company but it's shocking how they don't keep to their commitment. One of was cars was ****** early Jan and the unit was removed from the car within 13min, till this day it's not found. We app**** for a no recovery claim which we were told that we will get feedback after 60 days. Now 60 days elapsed, no update from them until we asked for an update. The response was "we are still investigating" no clarity whatsoever as to what's taking so long, how much tume they need still or is this their way of avoiding to honour their comment? To think all my cars are under them 🤔