Whilst the agreement was in place, I don't think it happened officially until we were there. I seem to recall a leaflet popped into the programmes for a game there that announced the deal had been "formalised". I think less than 2,500 were at the game in question, so not many will remember (I've...
It's not an easy thing to come to terms with as a parent, but the OP has to just accept that there's no point buying tickets for kids that don't want to go.
If they later decide they do, then you will have to work out how best to achieve this, but there's really no point in complaining about it...