NSW Toyota Finance and Default Listing

Hi. I had recently applied for home loan and found out it was on hold because of a default credit listing on the credit check file by Toyota. I had made arrangements with Toyota to do direct debit which they didn't do and also did not receive any default notice (Toyota Finance responded to my call saying they had sent the notice). The home loans not going to happen unless the default listing is removed.

What can I do to remove the default listing?