I think pollies are still old school about contact because it deters the masses from actually getting up and doing something about an issue. Rob hull's DoJ website only has a mailing address:
121 Exhibition St
Melbourne VIC 3000
Tel: 03 8684 0000

Digging a bit deeper, I found a few more contact details: I suspect the first one might get Mr Hull's attention

Crown Counsel - Department of Justice
25/121 Exhibition St
Melbourne VIC 3000
Email: CrownCounsel@justice.vic.gov.au

Victorian Parliament Law Reform Committee
Parliament House
Spring St
East Melbourne VIC 3002
Tel: 03 8682 2851
Email: vplrc@parliament.vic.gov.au