About all you can do is try to get access to the verification email and/or phone, maybe by a password reset or by creating another account with the same userid (easier to do with the phone number).
Of course that may not be possible or more hassle than the account is worth. It may help if you could try to log into the account with the same or a very similar IP as that was used to log in on account creation or when you logged in ok last.
Also, if you are still logged into the affected account on an app installed on some device you could try accessing the account from that.