As far as I know iTunes gift cards aren't available in Saudi Arabia. What does it say on the backup of the card ? The ones I have here in the UK say that they are only valid for the UK store - all iTunes gift cards are country-specific and can only be used in their country of issue
the thing is that this is #1 store in the kingdom and they sell lots of cards since years, so if its not working how come they r still selling it, i think there is a way to use it. i can still go there and ask for help, but thought i can get help here. thanks anyways.