Unable to change Pay Super Authorizer

I am new to this role and have recently updated the MYOB account by transferring ownership to myself and removing the previous owner's details. I have also authorised one of my colleagues as an Administrator. Both of us have full access rights, and I am listed as the Owner and Online Administrator of the account.

However, when I access the Pay Super Authoriser page, the previous owner is still listed as the Pay Super Administrator, while my colleague is listed as a Creator. There is no option for either of us to change or assign the Pay Super Administrator, despite having full access and administrator permissions. To resolve this issue, we have already tried the following:

1. Contacted the MYOB support hotline and waited on hold for over two hours without being able to speak to anyone.

2. Sent an email to the Pay Super team, but it was returned because the mailbox was full.

3. Submitted the signed Change of Details form to MYOB on 2 June. It has now been over two weeks, and we have not received any response.

At the moment, we are unable to process superannuation payments because we cannot assign the correct Pay Super Administrator. This is becoming increasingly urgent as we need to comply with the new ATO legislation and ensure our employees' superannuation is paid on time.

I feel that I have exhausted all available support channels and would greatly appreciate any advice or assistance. If anyone from MYOB could help update the Pay Super Administrator or advise how this matter can be escalated, it would be greatly appreciated.