I hate to say it, but I think you'll find nothing but frustration on this point. DJI's "Smart" batteries are designed to shut themselves down if they detect a damaging failure. This, of course, seems counter-intuitive, since a fall from elevation is also damaging, and takes your craft with it. There are many threads on this forum about this subject -- similar shutdowns can occur in cold conditions, and crafts have been lost with no compensation from DJI.
The logic is strange -- there's nobody here that would sacrifice their UAV in order to save a battery, if that was even an option.
Those that fly in cold weather have created in-flight battery warmers to prevent their Smart battery from smarting their UAV into the ground. But your problem wasn't due to cold weather, of course.. I understand. But the logic is similar.
DJI will likely argue that had the battery not shut down it would have failed soon after due to overheating -- which would have been a crash as well. They are looking at the distance, time, throttle position, and angle of the craft and determining it was being pushed so hard that it was going to fail anyways due to the overload. I believe they would argue the battery failure was imminent, and would not have gotten you back.
I don't support the logic, but the ability to override their shutdown appears as though it wouldn't have helped you. There's a reason that people are opting for 3rd party battery back-up systems like Ralph at FlyHighUSA are selling.