I have a court order showing that I'm the parent with residence.
Out of pity for my ex last December (never show pity!) I said I would stop claiming tax credits so he could claim. I have a better paid job. The fucker not only applied for tax credits, he also applied for child benefit, without my consent. I objected. Cue a 12-week wait. Now child benefit told me they've decided the child is not my ward and I should not receive the child benefit. I can appeal, if I ever receive the form they send out (they have my correct address but correspondence they claim to have sent doesn't seem to arrive).
It's not even the damn money, although I'm out £320 by now. It's the fucking stupidity. It's the malice of my ex when I was trying to be kind. It's being told over the phone that my DD is not my ward (or was "removed from my ward") as they so nicely put it).