Purchase bug

I tried to purchase 500 San Van Bucks from the store, alt tabbed to another screen to find my card details, came back and entered incorrect details a few times by mistake. upon finishing the transaction, it has selected the most expensive package or 12000 point for £87.99?! At no point did I choose to purchase this, and there was no payment summary on the EA launcher before the payment was confirmed? I am absolutely livid. Is there any way to refund this? I won't be spending any of these points in case.  Why is there no payment summary window?