Victim of fraud - debt recovery

Long story short, I was a victim of complete identity theft in 2022. In 2023 I received a letter from Centrelink about overpayments worth $1200made into ‘my’ bank account, from someone else’s Centrelink account. The bank account wasn’t mine, however it was opened fraudulently using my drivers licence, so it appears to Centrelink like I received the payment fraudulently. I’m now dealing with the investigations team at Centrelink with the onus to prove that I never received the money. I’ve given them extensive evidence of the identity theft, but they still claim that I have to prove I didn’t have access to that bank account. Given that I reported the account as fraudulent to the bank, they won’t give me any information, as it was not mine. Any advice on how to proceed, or any other experiences with difficulties with the Centrelink investigation team would be appreciated!!