If you got scammed in a casino, should have evidence, if you do send it to an SA:MP RPG Admin+. If you don't I guess harassing managers to obtain logs for you is the only way you will get your money back.
Deathmatched in Casino with no admin on? Should have evidence, if you do forward it onto samp.argonathrpg.com (email). If you don't, I do not see any reason to harass anyone about it.