Unpleasant situation. If you are not lying and telling the truth, then I am sincerely sorry that you had such a trouble, but still you have obligations in your activities.
I have seen many times how managers, such as Hhampuz or DarkStar_, paid money from their own pocket if there were any difficulties with payment or communication with the owner of the advertised service was difficult for some reason. This is the price of the business, your reputation = your responsibility for the funds to the customer or to the campaign participants.
Be that as it may, but the responsibility for the loss of funds lies only with you. Sorry, but the situation is not in your favor, and if someone now wants to put a flag or a red tag on you, then it will be well deserved.
Very correctly stated. And, as a matter of fact, I've already seen another Reputation thread exactly on this: people asking who's to be blamed / tagged for the loses.
https://bitcointalk.org/index.php?topic=5433651.0;topicseen(Of course, as usual, it's not the campaign members asking this in new thread; but that's another story.)