Unfortunately wait times are extremely long at Optus at the moment. Your issue is also not one of the priority four Optus has flagged so may not be sorted either. All you can do is wait and hope:
To regain some power would suggest you set up a free GMail account. You can set it to automatically import all old and new Optus emails and maybe you can see yours that way. Ultimately I would be ditching the Optus email (or any RSP) as you will lose it if you ever leave Optus (means that when you tell them you are desperate to get it working they quietly smile). Start migrating now. GMail has better security, much more space, features, spam filtering, etc.
