@carbo Please message Optus Support 24/7 from the My Optus app. If you do not have access to the My Optus app you can use social media to contact Optus Support, please send a PM to Optus on Facebook or a DM on Twitter and include in the message you do not have access to the My Optus app.
Phone 133 937 ignore the prompt to Press 1 and wait for the options. I have read the wait can be a long time.
You can go the old fashioned way write a letter
Optus Customer Relations Group PO Box 306 Salisbury South 5106