Given the fact you still haven't apologized to Intersango and are acting like a spoiled child, I think they should charge you a license for back programming contracting of 5000BTC .  If you don't want to pay it, you should pull every line of code that they helped with out of your codebase.  It is not up to them to tell you which lines this is, so unless you have specific version-history knowledge of their contributions, they have the legal power to force you to throw out all of your code.  You should be gracious for their past help, and apologize for your outrageous acccusations you have made in the past 48 hours.

Intersango seems like they are way nicer than me though, so feel lucky.