I can believe you, or not... it doesn't really matter, as I'm a player like yourself and I have no more power to influence this than you do. If it matters to you: I have no opinion on the subject, because I'm aware that I can't know the truth.
The problem here is that you're accusing the game client (a very unreliable and insanely glitchy part of the game that runs in your browser) and I just don't see how could the support agents verify the claim. They could believe blindly, of course, but then anyone else losing their units to a mistake could make the same claim as you did. They have to treat all the players equally.
This really has nothing to do with you being right or wrong. I simply see no way in which the agents could respond positively to your report, that couldn't be abused if applied in general.
The situation sucks, is what I'm saying. I have no solution that would make you happy.