I mistakenly bought an iTunes ringtone 3 times?! How/can I get two refunded?

okay, sounds silly I know, how does someone mistakenly purchase anything 3 times but in my defence I thought iTunes would realise I'm buying copies and ask "you've previously paid for this item, do you want to purchase it again?". Alas, I checked my iTunes purchases to see I'd paid for the same thing three times.

Is it possible to get the extra ones refunded? IF not, does anyone like AC/DC's song "You Shook Me All Night Long"?! Cause I'll gift the extras if I can't get my money back!

hoPe you can help....