Facebook — Unable to use two step verification to login through browser as the number is no longer in use

I have created facebook account approx 10 years back..the mobile number entered under profile information is no longer in use.

When I am trying to login through browser for meta certification login. It is asking for two step verification code from my phone. As the number is no longer in use I haven't receive any code.

I tried code generator and even tried changing the text message to another number for receiving code. But none of these method is working

The main problem is when i tried to update my new mobile number, even that is not working.

Please do suggest me to update mobile number for two step verification or disable the two step verification without login via browser through app.

This is urgent. Please help me fix this.