Air Asia — claim regarding theft in airasia flight no fd 3091

We took flight of air asia flight no fd 3091 from bangkok, don mueang airport to fuket on 18 th nov 2018. While reaching we found that pilferage from our check-in luggage has been done and gold ornament, watch and cash of more than rs 50000 inr has been stolen.
We have written to the airline airasia about the same and my complaint reference number is 07683402.

We received following reply from airasia authorities

"we are truly sorry to say that we cannot be liable for any case of the lost items from checked-in bag"

Please advise how to get the recovery.
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