It is not possible to just hack into anyone's account and recover/steal their coins; the victims have to make a mistake and be loose on their security, before they can possibly be hacked. Anyone who is promising you that they can recover your lost coins is a scammer, Bitcoin transactions cannot be reversed and your best chance is to report the case to the authorities, though in most cases they cannot also be of help to you and can only try if it is a large amount you lost.