Thanks so much for all your replies and advice.
I can report that i submitted my complaint to bcasino yesterday and today I recieved a call from them, as well as an email,confirming they will be paying out in full the 2k!! I'm completely gobsmacked as I really didn't think I stood a chance, but so over the moon with the outcome. :-)
That's exactly what I thought toothat the rule is max 5 bet. However they are saying the max bet is either £5 or 10% of your bonus balance which ever is the least amount so i should of only bet a max £3 per spin. Thjs is what i find confusing and contradictory as they base the 10% in your bonus money, which in this case was £30 But for all other matters relating to the balance, e.g wagering requirements they refer To The bonus balance as my 30 plus the bonus, which is I bet 5 a spin as I thought that was the max allowed as 10% Of my 30 plus the 30 bonus would have given me a £6. I don't know if any of that makes sense other than in my head!!