Yes have received the same but with a different number 1300 661 723.
I do not have an account with origin either.

Just got an email from Origin Energy to say we had not paid our account, funny we don't have an account with them. when you go to download the account you get a zip file - i suggest not to open, the phone number above is the one on the email but when i looked online Origin number is 13 66 83