Thank you very much for important information..Hi Vince ,
I understand you are going thru a lot of stress.. dont worry everything will be alright
1) Get a Certified Statutory Declaration from your Cousin that you are staying at his place.
Statutory Declaration format can be found here
2) Try to upload all your Bank Statements for two years - Bank statements will help the CO to decide if you have lived in a Designated area.
Contact your bank for the Statements or you can get it Online too
3) Government documents which as your address on them ( Example : ATO letters , Car Rego , Medicare levy certificate , etc )
4) Any letter which has you name and address on it
Good Luck mate ..
Hope you get your grant soon,