@Kazbee Yes Crowd has no access to customer accounts/orders. I have listed some options for you.
You can message Optus Support from the My Optus app. If you do not have access to the My Optus app you can use social media to contact Optus Support, please send a PM to Optus on Facebook or a DM on Twitterand include in the message you do not have access to the My Optus app.
Please see this recent postfrom fellow customer Lewisoz with the current best advice and correct steps to follow on how to cancel your service.
You can go the old fashioned way and write a letter to
Optus Customer Relations Group PO Box 306 Salisbury South 5106