Either buy one and level from scratch, or call blizzard and tell them that your old mail (the mail the gold company used) is frozen because it is outdated etc etc and that u need to change it (Problems:
They wanna know your Authentication Key
They want to see some ID papers
They tell u to go play AoC)
But luckely i got some solutions :O They all suck tho, but could work:
Your CD-keys was destroyd when your house burned down
You scammed the account and therefore dont have ID papers, or u could try the good old trick saying that u are Mexican/Chinese and your uncle got you into this country by having u in the back of his trunk or some shit
Or just scream; THIS IS SPARTA!!!!!! And run