@Pedro1656
A lot of hosts are putting up or considering putting up their prices due to increased utility costs, increased mortgages, increased cost of pretty much everything, and that is understandable.
However, the host is NOT allowed to put up the price during your stay, at least not for the dates you already booked via Airbnb. When making a booking, both you and the host are entering into a contract with cancellation penalties involved. That contract includes the price that was agreed at the time of booking. The host can only ask you for extra if extra services were offered and accepted or if there were damages caused by the guest. They can not charge you extra because the bills went up!
Also, this host's threats sound close to extortion to me. I would do as others suggest. Try to find another place if you can as a back up and report this host to Airbnb and ask if they are able to relocate you. Try to keep all conversations on the Airbnb messaging system so that you have some evidence.
If, however, the host is asking you to pay extra for extending your stay or dates booked outside of Airbnb, that is a different matter...