Can't sell world wide.

My listing has been seen in the USA and an Ebay member wants to buy. 

Because my account seems to be locked as Australia only he can't buy my item.

I've spent days trying to find out how to change my account to world wide but to no avail.

Are there any Humans employed by Ebay or just the idiot talking robot/computer which gives answers that have nothing to do with the question.

HELP!