You're asking for comments, but what you really want is people to agree with you. We have not heard the 'other side', so it is unfair to ask for a judgement call on who was right or wrong. People, unprovoked, generally do not go off and make up accusations. People usually hire others to perform a task that they ask them to do. You may think that you weren't argumentative, but you are not him. It sounds like you did not hear the complaint being presented, but heard it second hand from your boss. Things get changed in second hand information, sometimes inadvertently, but sometimes for a reason. The situation can sound worse than it was. If your boss expects a return business or even just concerned about his reputation he will not likely to try to defend you, but will seek to pacify the owner some way, REGARDLESS who was right. That is just smart business sense and you may learn a lesson from it or you can go and pout. Your loss.