i wasn't attacking you i was just wondering what halacha dictates, b/c i remember learning that if a company that is not owned by yidden makes a mistake with your money (in your favor) you don't have to go back and fix it up, but it will bring bracha if one does so. i was just wondering if in a situation where the money was given on premises which were thought to be true at the time the money was given, but later proved false has the same halacha. i guess this situation is diff halachically and a rav should be consulted if one has a q. and by the way, the fact that no one does it does not make it okay to do- many ppl don't follow halacha today- a majority of yidden in fact, does that render such behavior acceptable?
i didn't mean to insult anyone with my comment i just wanted to know what yeshiva educated ppl had to say on this topic, that's all.