I have been working on a "big" advertising website for a known company in my country. The job wasn't much paid but interested so I did it. I also worked lot of overtime to build everything they needed, and they thanked me a lot for that.
But then when it comes to payment, no one is answering me. It's been more than a month and I can't get any contact.
So I'm thinking of just shutting off the website, or directly adding a message on it, that would generate bad buzz for them and bring attention. Do I risk anything legal doing that sort of things?
For the precision: I have not signed any contract specifying any sorts of term. I have just a signed invoice with a description of the work. I also wasn't the only person working on it (I was on the technical part but there was some artists and authors too)