Hey @Courtneyy, these charges are known as Premium SMS content services, I'd need you to follow the instructions below:
jump onto live chat → www.optus.com.au/livechat/pmobi. You'd need to ask the consultant to action the following for you.
We've recently made a commitment to suspend a number of third party content providers by January 31st. For more info you can check out our blog → https://yescrowd.optus.com.au/t5/Blog/Changes-to-our-Premium-Services-offering/ba-p/351928.
“We’re suspending certain subscription-based Third Party Content providers on all mobile services that use the Optus network (except Virgin Mobile Australia customers)."