Because firstly it's a breech of contract law, and while CBI might not have enforcement powers against the fund, that doesn't mean a fund can do whatever they like.How were they misinformed exactly?
And then, since the service providers are all regulated, the CBI does have enforcement powers on them to ensure the contract is followed. There's a whole piece of legislation devoted to them: http://www.irishstatutebook.ie/eli/2015/act/21/enacted/en/print.html