They can not offer you a proper email or phone number. That would mean accountability on their part. As as a privately held company who shits all over massive people, we wouldn't want that for them now would we? Better let us all talk to the wall, it seems to be working great for them!
They do have a "New York Office" if you would like to mail a letter to try and reach out. Just be warned that their office is a "P.O. Box".
In the mean time you can always talk to the Steem sock puppet accounts BernieSanders & friends. They will assist you with every last concern by flagging you into oblivion and stealing your rewards! #steemblockchaincustomerservice :D
Oh one last thing.. here is that fancy office in case you were curious..
