That's a recharge selection error!
Well, you can give the Optus Customer Service a phone call at 1300 555 002.
They can process a once off adjustment on your account, but moving forward.. Please be careful with the recharge selection and double check the details!
My answers are just my opinions. It doesn't represent Optus or any of it's staffs.
Click Kudos if you find it helpful, and mark it as an anwer if your problem has been resolved! 😉