I was unenrolled from automatic bill payments

I have been using automatic bill payment since I first got my account almost 2 years ago. Today I received a text saying I missed a payment. I checked my email and yesterday, when the payment was due, I received one saying I was unenrolled from automatic bill payments. I did not do this. I live alone and no one else could have done this on my behalf. I will pay manually today and re-enroll, but what could have happened?!