Torn about this one so decided to ask what others think. I occasionally write articles for a company and get paid for them per each article written. I don't have a full-time wage with them, and each article has its own invoice. I have now not been paid for almost 2 months since my last article got published. I think this is unreasonable, however, here is the catch: there is no date on the invoice. I tried searching if they are still expected to pay within one month, and couldn't find anything concrete. I have already asked their CEO who hasn't responded at all, and asked another manager who reminded the CEO to pay. I still haven't been paid. I am not sure what to do. I am tempted to write a more harsh message saying that not paying for two months is unreasonable and I'm expecting my payment. What I'm fearing is that I won't get future jobs if I do this- I could really use the money. What would you do?