This is a copy of https://bitcointalksearch.org/topic/help-me-please-my-bitcoin-is-going-away-4437135
It's possible you're in a panic when you see funds leaving your wallet, but posing duplicate content will just lead to confusion. Lock this thread, and stick to the one you opened previously please.
EDIT: after some further digging, i found that this address is part of this wallet: https://www.walletexplorer.com/wallet/Huobi.com-2
It's part of Huobi.com's hot wallet. So if your story is legit, you were scammed by a scammer who gave you a watch-only wallet monitoring an address belonging to an exchange to keep you happy while they robbed you.
You where right, I have told him to contact the mining firm immediately.