Hi @Bhumika,
Thank you for your comment.
This is my discontinued previous phone.
So, it is understandable that the new phone number owner can login.
But, it is Airbnb's system fault that the new phone number owner can change name and email and password.
It is also the new phone number owner's fault to take over my account instead of creating new account.
For some time, I could login with my email and password, but the new phone number owner decline to change the registered number to my new number, and he changed email and password. So, I cannot login any longer.
I did google search, and found that this issue was reported 4 years and some articles were written and Airbnb CEO was interviewed, but Airbnb has not fixed this issue.
It is unbelievable that in Airbnb 1 step verification (only phone) can change everything.
Any good company requires 2 step verification.