I've now entered my debit card number 18 times into the League of Legends store, restarted my client twice, and it still claims that the card number is invalid.
I have used this debit card 3 times in the last week with no trouble. I am absolutely certain that every single number I entered was exactly correct, and my company told me that there's no problem with the numbers or anything, and I have more than sufficient funds for $5 of RP.
This isn't working and I'd really like to be able to get Bladecraft Orianna. Halp?