No pet policy; Airbnb didn't accept my pics of damage done

[Sonia1912]

I have a no pet, no smoking policy in my unit. However we had an AWFUL guest who left the place in a huge mess, cigarette butts everywhere, pet food in a soup bowl on the floor, a pet 'pee mat' on the floor that smelled awful... was able to get some compensation to get the smoke smell removed, but even with the photos of the bowl and the pee mat and the stain on the wood floor where the pee had leaked onto the floor, my management company told me they refused to cover the pet damage because there wasn't 'enough evidence.' 

WHAT??  What kind of evidence does Airbnb need that the guest violated the no pet policy?  I don't have any pics of the guests with a pet. The unit is in a condo building where the guests pick up a key from concierge, so I didn't see them walk in with a pet.

I am confused and feel let down by Airbnb not protecting their hosts from nasty guests. Without hosts, they have no business, so they need to protect us too.

Anyone have any feedback or ideas?