Optus no longer accepts complaints via phone. One can only assume that it is because of the sheer volume of complaints that they must be receiving with the ongoing 3G network issues they are experiencing.
Should you need to complain to Optus, I can only strongly suggest that you don’t even bother calling to complain. Ensure that you have previously complained when you have had issues and have called support, and that those details have been received – but when it comes to the official complaint – simply write a letter and post it to the address below.
PO BOX 360
South Australia 5106