Watch out! Scammers! They give you a deposit address, but if you deposit something will never get it! They steal your coins. Dont send them anything! You will lose your coins!
Are you talking about CoinPot? There are user complaints here about them not getting their coins. But for me so far I have not lost a deposit or a withdrawal. But I'm saying that with apprehension. I don't know what's really going on for example if these users have violated any rules or not but CoinPot has simply chosen to ignore them. Having said that, a lot other users have had positive experience, me included.
I too have always had a good experience but like you these kind of posts make me nervous. Perhaps the OP can elaborate on what exactly happened and whether it was CoinPot's fault or theirs?