Packlink complaint: Denied Damage Refund

I sold a Model Car item through eBay and opted for Packlink to send the item via UPS. The item arrived damaged and Packlink put a claim to UPS. UPS upheld the claim and paid out to Packlink. I have chased Packlink for weeks now and recieved an email today saying the claim has been refused due to insufficient packaging of the item.

How they can say a model car, attached to a plinth, wrapped in bubble wrap, polystyrene, the models sturdy box, and then place inside a extremely sturdy packaging box is not sufficient.

The car arrived smashed from being thrown forcefully, and UPS accepted responsibility and Packlink refunded me the Insurance difference on postage with a view to paying out the remainder when UPS paid them.

Packlink have held onto the claim money that UPS paid out. If this was sent via Royal Mail they would have paid out the claim alot quicker as they would accept responsibility. UPS have admitted responsibility, but Packlink have refused.