They were offering like random increase to deposited ETHs. So for instance if one was to transfer 3 ETHs, you could get IIRC up to 9 ETHs back.
It was staggered and the more you deposit to their address, the more you could get. The max ETHs they would send out was like a 1000 or so? And they said it was coming back from the same adress you deposit it to.
These few lines is a sign that it is a scam. If you are knowledgeable enough, you will notice that this is impossible. It is like Bitcoin Doubler in Bitcoin or the "100% in X amount of days scheme". The more ETH you will send, the more ETH will get scammed for you It was staggered and the more you deposit to their address, the more you could get. The max ETHs they would send out was like a 1000 or so? And they said it was coming back from the same adress you deposit it to.
. I hate to say this but being a newbie is hard especially if you are holding a huge amount of money .The live chat was also filled with lots and lots of postive messages about people receiving like 30 ETHs or some that supposedly deposited way more than 3 ETHs got back up to 100ETHs. There was one official support employee in the chat who moderated it and provided "support".
Whatever the comments and messages are, the fact that this is "too good to be true" is already a sign that this is a scam and yet you fell into it. Can't blame you since I will assume that you are a newbie in crypto but you're stupid to hold a huge amount of ETH yet you are not that knowledgeable when it comes to scams like this.I waited and waited and also others were writing in the chat about why i takes so long...
You and the others who waited are the most naive persons in the world. Hate to say this but it is true 
.[ETH] I was scammed on Youtube. What to do?
You have 3 choices.1. Call a police and share to them what happen to you.
2. Trace the scammers if you can do it.
3. Move on and take it as a lesson for you.
You will not learn if you don't commit mistakes like this trust me
at least now you learned something right . Don't do it again and move on.