How can I get revenge on large building firm?

Have a long talk with your local C A B They have a cache of retired or very knowledgeable people that thrive on such cases If they send the company a letter adviseing them of there involvement it quite often stirs the mud enough as the company then know there dealing with a bottomless pit of knowledge. What ever the outcome make sure you move in,as then if you fall a little behind you are in a negoteable position,and bearing in mind the present rise in house prices,you will either still be there or at least break even.With all this going on take every chance to blacken there name without leaving yourself up for prosecution.Believe me if you wait and smile your day will come and it makes it so much sweeter when it does David V Goliath best of luck G