If (and only if) they won’t let you have a refund (which you can prove by posting their rejection reply):
Give me your account number (i’ll send you the 20 quid), don’t be so stupid again and again don’t be so stupid again. And I really really hope you are not lying with the kid stuff and all.
Also, you would of course then have to transfer all of your pledge reward to me (I would give it to someone as a present).