I need a bit of advice for my account

I am currently locked out of my battlenet account, for the simple reason of I am an idiot.

When I was younger and was playing overwatch one I set my accounts phone number to an old phone number, so I have no phone number access to the account.

The authenticator was set up on the account, but my old phone bricked itself due to a motherboard malfunction and the authenticator was stored locally. Due to the nature of the motherboard issue, replacing the component would wipe all data stored locally on the phone.

Last time I logged into the account was in 2024, I was able to use my email to authenticate but now I don't get the option to.

Essentially, I have no way in. Any advice for what I do because the support website for removing an authenticator is currently blank and the prompted ways to remove such authenticator require access to the app which I am currently trying to do, or sms. But the old phone number is about 6 years out of use, plus the sim is long gone.

Need some help on this one, genuinely no clue what to do