Contact number on their site 1800 92 38 08
http://store.apple.com/ie - Not sure if you will get much satisfaction from them however ....
Did you have a previous itunes acc ? If so are you sure you didn't register that contact number as they may have pulled that from there. When I order my free iPhone4 case, instead of shipping it to the address I specified (my work) , they selected as my billing address. It never showed to either address and they had to send me another one