Email compromised, can’t connect device to new email

HiI set up my doorbell and chime some time ago. My email was compromised and so I set up a new email address.I tried to amend my email on my original account - but the 2FA sent the code to the original email - that I can’t access.I set up a new account on the app using my new email - but when I try to scan the barcode of the device it’s says it’s still attached to an owner.My chime is just flashing and there’s no sound so doorbell effectively useless.How do I resolve please?Many thanks