[wjnc]

Lol, with all respect, taking down a companies website even with credentials given to you (for another job) can be construed as hacking. Revenge hacking can get ugly pretty quickly (criminal offence). You have a contract for X, do X and don't get paid for X. The conflict over paid for X is in a whole different ballpark than illegally using credentials for Y (taking down their site, with obvious damages as a result).