Locked out of an account while trying to update the email address

I am a registered disabled person, in Australia, and several of my service providers use your e-signing system for me to access my services. So, I am currently unable to access critical support services until this matter is resolved.

When changing an account email address, your workflow is designed so poorly that it is possible to update the email address in the account before we have verified the new email address, in the email you have sent. So, when we try to verify the new email address to log in, it states:

"Please confirm your email or use old email address to login."

However, the old email address in the account we've just updated has already been changed. So when we try to log into it, it says:

"Invalid username or password."

Now I can't contact you from that account at all because I am locked out of it and the only way you can open a ticket is by logging in. I have had to resort to asking a friend to post this to the forum to see if there is anything we can do to resolve this!