Host Pet Allergy Problem: Awful Airbnb Guests

I have had several problems with Airbnb in the past and I am a Superhost. This time was so crushing. I specifically stated I have a no pet policy because my oldest is extremely asthmatic to dogs and cats. I came home to find the guests brought a dog into my home and it defecated all over the house. It was disgusting. After 40 emails and pictures, Airbnb would not refund the carpet and house cleaning bill. Sadly, this is not the first time Airbnb has sided with a guest over a Superhost. I had a guest cancel on me at the last minute and I have a strict cancelation policy; Airbnb refunded the guest in full. Airbnb customer service is perhaps the worst I’ve encountered. You cannot actually speak to Trust and Safety and when you call the help desk they claim they have no way of getting a hold of the team. What is the point of a security deposit if a guest can break house rules and not be held accountable?