Is the pot shelf an integral part of the hob?
If not, I understand why your insurance company cannot see their way to paying out.
Who on earth was daft enough to put a shelf baring heavy objects, or indeed any shelf at all above an induction or ceramic hob?
The place for pots and pans is under the hob in a cupboard or on a shelf, of if you cannot get down easily on your knees to get them out, in a cupboard beside the hob at a level you can easily use.
Buy a new hob and re-organise your kitchen to obviate this kind of accident again. Modern hobs are unfortunately not cast-iron!