I think just remain positive. Do speak vetassess and ask why they refused and what you could do to get a positive assessment, they are very helpful. Also a statutory declaration with as much detail as possible will go a long way. ( Explain in depth from getting your qualifications to pre and post employment and also daily activities at work etc etc.) also lots of letters from previous employers, managers, team leaders outlining you daily activities and what you undertook. (It's annoying to ask them, but they need to do it).
Remain positive, where's there a will there is a way.