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.

Print out copies of the relevant documents above so that you have them in front of you.

It looks as though you may have typed this on a phone and in a hurry. I would pull all of this together in plain and simple declarative sentences so that it can be easily followed.