It's a full blown lie, a false alarm, crooked story and not really worth any advise.

OP didn't mention about recovering his wallet that means he watched his investment grow and through out those period of holding and waiting, nothing pops to his brain on what to do with the profits.

Even a billionaire investor won't seek help from a forum on how to spend $1.8M BTC. In my observation, OP don't own any Bitcoin.