Ok i am not sure it is official pancake telegram being hacked or it was fake account from the beginning. I mean it has almost 238k followers. Now telegram showing scam along with it. And it's latest message asks for synchronizing your wallet for fixing issue which is clearly scam. So whatever the case beware of it.
Indeed, very often someone sends messages on Telegram either in the form of a link in the form of an investment, but I always ignore it, because many events are in the name of whether it's a project or investment by exchanging via links. So I think what happened to you is a scam, moreover you have to synchronize your wallet so please always be alert and be careful if anyone exchanges messages on behalf of pancakes, you have to find out first to make sure it's true or not.