Luggage Warranty

Just had a case with my new Samsonite cosmolite, the lock was broken in by unautorized person while travelling from Bangkok to Australia. It seems to be broken so easily as you can barely see the damage by the look of it. And Samsonite said the warantee is invalid as it is broken in and advised me to pay to have the lock repaired.
Never again with Samsonite. It is actually not much different from a cheap luggage. Worse, it becomes the target to be broken in.