anyone got any suggestions what to do when a client wont pay for increased development costs for work you have already completed? 5:01 AM Jan 18th via web

Should I change a bad clients site to a page that says they aint paid me and then change the password? 7:08 PM Jan 20th via Twitter for Android

this is what I am reduced to http://bit.ly/badpayers 8:34 AM Jan 21st via web

Followed by about a dozen identical tweets, until it got picked up by HN.

Note the key section: "when a client won't pay for increased development costs".