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Yes I get the exaperation in your voice. My advice is to pay the amount ($155?) requested now (unless its too much for your budget)
As you say non payment can have far reaching consequences (These days non payment of a bill (even if Optus fault) will be added to your credit rating after a month or so and can be difficult to remove.)
Optus will get there in the end and can refund any overpayments. From your post you should be able to clearly identify where Optus has gone wrong (tally up payments, fees, etc.) and end up with a figure still owed to you. The credit department can then either dispute that amount (and tell you why) or refund it. If unsuccessful then you have the TIOs number.
But for now, pay the bill and remove the urgency/stress of getting it sorted.
Regards
Peter Gillespie
Much more digestible 
not sure I've hit a posting limit (and I've written some pretty long ones myself)
I understand the mistake is on Optus end. However until it is sorted you'll be the one's paying for it. Getting follow on effects (like removing entries on your credit rating) will be up to you, not Optus.
Its always fun to talk about courts , but the reality is matters such as this almost never end up there. You've already suggested one of the main problems now is not so much the money but the huge amount of wasted time and effort involved in getting Optus to sort this out. you can either keep going down that path or reduce the hassle (either way will see you get a refund eventually). So my suggestion would be:
1. Maybe a last call through to Optus Credit department (the cheque might already be in the mail).
2. If no luck pay the bill (or not)
3. Cease communications (that obviously aren't working)
4. Write a proper letter of complaint to the complaints department, detailing what was said, charged, paid and what you want back.
5. Maybe that works (you should at least get a complaint reference number)
6. If not, after 10 days, forward letter to TIO and let them sort it out for you.
7. Done
Alternatively, hire a lawyer and get to work building a case to recover your $150 (+ $10,000 in compensation presumably 
)
Good Luck
Peter Gillespie
Hi @Kamera, it's disappointing you've had so much trouble getting this sorted out. Going off what you've said, the outstanding charges should be credited back. Could you send me a PM with your full name, account details and DOB so I can look into the status of the investigation?
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