Sevene

I'm in Australia, I can't purchase lindens when I do it says there was a error with paypal. I'm trying to sell my lindens and it just says my trading limit is 0. So, I've researched and found out that I'll need to purchase some lindens inorder to verify myself. Do i need to try to purchase lindens with a credit card not paypal? Am I unable to do this because I am in Australia? Is there any way I can increase my trading limits without buying lindens? My aaccount is payment verified but my billing information is not present - it is verifed because i bought stuff from marketplace thank you