Ask HN: Client Isn't Paying Their Bill, What Should I Do?

As of this Friday it will have been exactly 6 months since the first invoice. The client is in the hospitality industry so it's especially troubling that they're not showing us any of it.<p>We were hired for a small but time-consuming and time-sensitive project at the end of last summer. We performed our work up to the high standards that we hold ourselves to, and subsequently invoiced them. (Now, I never do work before getting paid, which is an unfortunate consequence of others breaking my trust).<p>After a few months, they informed us that they were not going to pay us until they used our work to sell one of their hotel properties. This was not the agreement. We did a job, provided an asset, and expected to be paid for that asset. They have been saying for months that they'll pay us when the hotel transaction closes.<p>On Saturday we gave them a final notice to pay by this Friday or we're going to turn it over to collections and file complaints with the Better Business Bureau and Dun & Bradstreet.<p>I'm not in the business of harming others' reputations, but this seems like the only negotiating power we have left. And the fact is we did a job and have not been paid for that job.<p>The final straw was when we contacted the Chicago office and they informed us that our agreement was with the Denver office, even though one of our contacts on the client team works out of the Chicago office. They are requesting we not bring the Chicago office into this dispute, even though their company name and the Chicago office address is the contact info listed on the company website.<p>The worst part? We were hired by our friends. I've lost respect for them as business people and as friends.<p>I'm reminded of this quote from Game of Thrones: "A Lannister always pays his debts". Clearly, we're not dealing with that House.<p>What do you guys and gals think we should do?