> If it isn't a phishing attempt it would be really surprising to me that they would use http.
Why? Technical incompetence is a systematic problem that comes from the top down. This is what happens when mediocrity becomes acceptable and takes priority over correctness.
I would suggest moving all of your business from Heroku ASAP. These kind of mistakes strongly suggest nobody capable of intelligent thought makes decisions at Heroku, nor has for awhile.
