New York City I hope this is the correct forum... Ok, I have a now ex-client that was constantly late in payments. I am a computer consulting and do many things in regards to computer setups and configurations. I installed and setup a server for this user after his old one kicked the bucket. We had a verbal (yes, the very fun word) agreement that in exchange for the server install/setup fees, he would take a service contract. He never did take the contract after about 4 months, so I sent an invoice for the server setup which was signed by his office manager. He will not pay the fee. Some of the things I set up for him, aside from the physical computer were User Accounts, FTP services, file relocation and the like. All of these are intangible services which allow him to conduct his business more efficiently. Denying these services will not stop his business however. The question is, since he is running his business on unpaid services, am I allowed to undo any of these intangible changes legally? There is no contract. Just a signed invoice that is not paid for. As soon as I called him out, he become very nasty. Also, I did kind of lose my temper over an email conversation when he finally said that if I fixed a problem he is having now with his WIFI connection, then I will get paid for the services rendered in the past... (sounds like blackmail to me). Can anyone answer?