Sigin in email - no access to old account

Multiple IT changes at the same time mean I didn't have access to my old email account when trying to change my profile.  O365 would have bounced it.

O365 has now been updated and the eamil address will present as valid again (temporarily).

No success in getting a ticket to be responded to by a human and not a bot - how do I raise a ticket to get my account reset so the previous bounce is cleared and I can reset the email address?

@Bri it looks from other threads like you managed to help another use.

Thanks

C