Optus needs to update the numbers database with a redirect to send incoming calls to the Telstra network.
You need to ask Telstra to contact the Optus Porting team to get them to finish the porting process properly.
Send a message using the My Telstra app on your mobile (blue icon, bottom right of Get Help screen). If the bot doesn't understand the query, type "Speak to a consultant" and you should be transferred to the queue to chat with a human.
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.
