Oh dear @Andrew1463 It’s really worth reading up on the basics before you start hosting to help avoid mistakes. Look at the useful tips and tutorials here and the FAQs on Airbnb Help Centre.
i would suggest you remove IB from your listing until you become more familiar with Airbnb. And so you can learn to vet guests.
Airbnb quite rightly takes host cancellations very seriously as it impacts on whether guests trust its brand and the wider host community. It would have told you when you went to cancel that penalties would be involved.
All you can do is call Airbnb and explain you made a mistake and see if there is anything they will do.