To contact the company you should go to company website at the address you know (which shouldn't be given in email as well), log in and send a message through internal message system, possibly referring to the email that you recieved through a random code (those can be auto-suggested if they recently tried to contact you by email).
If you do anything else your communication knwowingly mimics communication of a scammer.
Unrequested email should always only be one way communication. Email is too untrustworthy for it to be anything more.