It is fair because you are just stating facts, and have not accused him of anything so far.
If breitlingguy has not responded to PMs or any form of communication for some time, and this is the way to get his attention, then its not a matter of choice.
An entire group of us is getting scammed by a watch modder here (read the thread started by me in the same section of the forum, over 5000 views, hard to miss) and see how we deal with scammers and potential scammers.
I think the tolerance level for scamming in this forum has plummeted recently on the whole due to the behavior of certain individuals on the forum.
If you have genuine reason to believe you are being scammed or shortchanged, and the other party is not responding, call him out and let him explain himself.