I know the feeling!
I recently rang Telstra to get some features turned off on my landline (caller ID, message bank) as I hardly use the line. Also I was being charged a few $$ every month for a handset I've never even seen.
After three trips through the voice response system (which apparently doesn't understand English), I finally got a real person who on learning what I wanted to do, said she'd transfer me to the right department. In the this case, the right department was the voice response system

I ended up just sending in a complaint via email stating what I wanted. It worked.