Thanks for reaching out on our Community Forums! I completely understand your concern regarding login issue. If your account is registered in Australia, you will have to add Australian number to your PayPal account. In case, if the number is removed or your unable to add it to access the account. Please contact us via call so we can validate the details and help you to get the number added, so you will not have any issues in future to access the account.
Please click Contact at the bottom of the PayPal website for contact options.