A plat's problem... Please, please, help! :(

[Fato]

Hi guys.
I hope someone can help me (even if my english isn't so good ).

We never had problems before, and I don't know what should I do...
This morning my boyfriend was trying to buy platinum (3x800 to be exact) at the in-game shop.
This wasn't the first time (we have a prepaid card linked to a Clickandbuy account) and usually, after he made the purchase, the money was taken from the prepaid card and the platinum was shown immediately... But today, after the second purchase, it says that the payment method isn't accepted and that we need to verify the information on iTunes and try again later.
We tried again and again, but nothing has changed.

I've checked on iTunes and on Clickandbuy, there aren't problems there.
And yes, there was enough money on the prepaid card.

I've also tried to buy 300 platinum, but it's the same story...
But if I try to buy 5 platinum, it works! And I can already see the platinum when I log on.

So, now, what should I do? Is it a game problem?
Should I contact the staff?

Thanks to anyone who can help me..

Edit:
I don't know exactly when, but now my boyfriend has telled me that when he try to buy 800 or 600 platinum it says "the purchase has not through you. You have to wait a while before making another purchase" or something like that...