Were you a google voice user? I had some hangouts disabling that needed to be done when I migrated to Fi. I could send texts, but not receive them, until I logged back into Hangouts and forced it to let go of my GV number, even though all other indication was it was removed. If you were GV, open hangouts and see if it is still grabbing your messages, and if so, unlink it (settings-appropritate goog account-SMS-toggle off messages).