By the way, I read about this type of scam in an article I found at Callercenter.com and it's actually called Cramming. It's where charges are added to your bill by third-party vendors for services you did not request nor allowed. There were also several feedback posted by those who were...
Thanks for the heads up! Had a similar problem with my previous telephone service provider but never refunded me. That's why I changed service providers. Good thing Telstra does treat customers well... Although I haven't encountered anything like that yet.