There's every chance nhughz they will ban you from opening a new account if you start making life tough, or accusing thier own staff. It's got to be worth it though hasn't it? I'd be beside myself with rage if this whole situation had happened to me.
I once lost £107 from my NatWest bank account. It turned out other customers had lost money too. Guess who was responsible? - yep, you've guessed it, a NatWest employee. I received a goodwill gesture from the bank (just to shut me up basically). I never knew what happened to the employee though, as he had disappeared to Miami the last I'd heard
Seriously though, I'd definitely contact the media. I'm sure the Racing Post would be interested! - it's full of traditionalists who would love to hear of negative Betfair press