Originally Posted by
Often1
Presuming that you can confirm that the payment was taken from your bank account and that you had e-tickets issued and you have reviewed all incoming emails from U2, I would contact U2 when you get home.
Does U2 issue e-tickets? Some European LCC (e.g.: FR, EW) do not.
This said, I believe there must be more to this story. No one will be able to help the OP unless he answers the questions asked in the previous posts.