Payment issues are unfortunately not handled through the forum. You’ll have to ask Support again.
What’s important is that if this subscription is for another region or for a new game license it will not be able to be applied to the current region’s game license. Which is intended, you’ll then have to apply for the gifted subscription to be refunded.
So if your game overview looks like this: WoW1 EU/WoW2 (anything else) then the above applies to you.