How to deal with a shady exchange?
This is either a scam or it's not. It's very easy to tell which:

Case 1: There are no actual signals that make a profit. In this case, it's a scam. Case closed.

Case 2: There are actual signals that make a profit. In this case, who cares whether it's a shady exchange or not? You have the signals -- trade larger amounts on a legitimate exchange, never try to withdraw from the shady exchange, and outsmart the scammers. You still make money.

But I'll bet dollars to donuts it's case 1. That means there are no signals that makes a profit. That means there is no profit. That means there's nothing to withdraw. The means you're wasting your time trying to withdraw funds that don't exist.

It's your exchange account, right? That means you can see what trades it's making. You can check on other charts whether those trades will or won't make a profit. Either you have profitable signals or you don't. In the former case, you're going to make money. In the latter, you can't possibly make money. You have everything you need to tell with.

But we all know which one it is. The signals don't exist.