Have you followed the steps for making a claim here https://www.airbnb.co.uk/help/article/279/host-damage-protection
So sorry to hear about these guests @Bettina254 . What were their previous reviews like? When you vetted the guests apart from asking for photo ID what other vetting procedures did you have in place?
Have Airbnb removed them from the platform?
If you are receiving death threats surely the police can liaise with Airbnb to get an address/other information about these people
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Don't take calls or respond to messages on your phone. Just message 'the guest' on the platform and confirm you will only respond through Airbnb messaging.