@Shukrullo0
All sounds a dodgy that does, many years ago I when I first got the phone number I have now had been used by somebody else, for a while I kept getting wrong number calls.
Im not a computer expert but airbnb should be able to fix your problem easy enough.
I do think airbnb should have a extra security feature at the moment just login with email and password maybe they should start by sending out a 4 digit code via SMS to your phone number that people have listed,
Many sites have extra security features these days, I have an account on one crypto exchange when I log in it sends me a code, and also I have my own personal 6 digit code to enter.
Considering there is a lot of money involved with airbnb all the peoples accounts I think it's a bit outdated,