Damaged bag due to negligence

Lift airline has to be one of the worst service providers I've ever encountered. I have flown multiple times with other reputable airlines and never have I ever had my baggage mishandled. I decide to use them for the first time and only to be met by such negligence. I checked in my bag that was intact with zero damages and it was returned to me in pieces with the inner protective cover holding my belongings in one place if it wasnt of that protective cover I would have been picking up my underwear on the conveyor belt. And the airline has the audacity to say it's your fault, and say it was on the terms and conditions that hard shell should not be used. Having such a clause doesn't mean that they need to be negligent and hide behind that clause, the airline will now need to prove beyond reasonable doubt that negligence was not as per result for the damage, their clause only provides protection to them if proper handling was followed, they talk about stacking procedure. The damages on the bag are not consistent with stacking as their clause states, the damage are consistent with falling, for them to deny liability they will need to demonstrate that the damages were indeed as a result of stacking, since the damage is consistent with that of a fall it then makes their clause null and void and full liability must be assumed remember clause are put in place to protect the airline and also the customer. In this instance. Liability of negligence is the case. The clause is very specific it states that the hard shell cannot withstand the stacking procedure it does not extend it to anything either than stacking, this damage is as of a different condition thus nullifying the clause and the airline must take on full liability until they can prove that stacking was as the result of the damage. They were very negligence and they're trying to run.