I agree with Jimmy, I think you are being strung along and it is time to step up the pressure. You don’t really say what the role of the EC has been in all of this, did they refuse to intervene?
In relation to the mediator – it is made clear when you go to mediation that the mediator cannot take sides or even express an opinion, so if that is what the mediator is doing perhaps they need to be reminded of that.
There is no way I would be agreeing to pay the costs of laying carpet, you’re right – why should you paying to rectify something that shouldn’t have been done in the first place!