presumably you've already contacted the people staying and advised them they need to make payment today or they will need to leave @Caroline2980
If they haven't paid and haven't responded to your request for payment they aren't your guests anymore . Get your cohosts to over to the property and turf them out .
this is not Airbnb's fault but a risk you take by accepting longer term bookings on a platform you know collects payment for long term stays on a monthly basis .