Hi Brenda, if you have a mygov account with centrelink linked.
Click on Centrelink so you go into their website. On the top left of the centrelink page there are 3 lines (next to the word centrelink).
Click on the three lines and a menu will drop down.
Click on "Income & Assets", then on "View/Update Income & Assets" and it will take you to the page with all your income and assets.
Scroll down to the bottom of the page to see what bank accounts and shares they have you as having.
At the very top and bottom of the page there is a link to update your assets if they have them wrongly listed.
If you want to change your assets click on that link and it will take you to a new page.
To change them, select the categories you want to update. If you need to update two categories (ie bank accounts & shares) I would do them all at the same time as if you make a change over $2000 they will lock your account and send you a letter (or text however they contact you) asking for some details.
I don't have anything to change so wont go further than that and tempt the centrelink gods, but you can follow the prompts.
If you want to make a complaint via their online portal, click on the 3 lines at the top again for the menu, and down the bottom is a link to the page where you can submit a complaint or suggestion. I found the complaints people to be incredibly helpful.
I hope that helps you :)