No legit exchange will ask you to deposit 150$ so you can withdraw your funds. Either you've already been scammed and are about to be scammed again ( by sending money), or this is the scam.
@OP listen to what AdolfinWolf wrote!
The site in question was created 35 days ago. Now this doesn't necessarily mean that it is a scam but it is relatively new and it surely looks that way.
http://whois.domaintools.com/tradeberry.org
Let me guess, someone contacted you over telegram telling you that he has some money on that site that he can't withdraw for whatever reason. But he will send you the money and you will withdraw it and and keep a percentage for yourself. When he sent you the bitcoins your account got limited and the only way to remove the limitation is if you deposit a fixed amount to do that. And now the other person is putting pressure on your calling you a scammer, since you have his funds and is threatening you to give him his money back.
Is that the story?