Hi Raul,
Thanks for taking the time to reply.
When I go through the process of claiming my super back via your second link I get the message 'Department of Home Affairs has indicated that your visa is still current. You will be eligible to apply for a departing Australia superannuation payment when your visa expires or is cancelled."
I can't cancel my visa via Immi account because my 457 visa doesn't appear in my account. I didn't set up the visa it was all done through my ex's employer and I was the secondary person on it. Do you have any other suggestions?