I would not have left the restaurant without calling the manager back to have the bill adjusted. If he hid in the kitchen and did not honor his word, then fine, get on the internet and call him a liar, and file a dispute with the credit card company and anybody else who cares to listen that they screwed up, offered you a free entree, and then didn't honor their word. But you chose to accept getting terrible service and then you chose not to insist on receiving the compensation that you were offered. It is now a "he said, he said" story. You can certainly choose to escalate and you probably should since it does seem like the manager is a bit of a fibber and people who lie to one person generally lie to many...but it would have been better to correct this on the spot. If it's an honest mistake, it would have been kinder to take care of it without an internet discussion. If it's a lie, which it probably is, since it's hard to forget you just offered someone a free meal, then it should be posted, but I would have wanted to be REAL sure the manager was a liar...thus I would not have left without giving a second chance. I do realize people are busy and don't have time for endless discussions...but if you do have time, use it!