Unauthorized charge

Xfinity just took an unauthorized payment from my account, even though I am not and never have been, set up on automatic payments. Even dumber, they took it for the wrong amount. It was $0.34 short. I called and spoke with a rep for 40 minutes while he communicated with his leadership through the computer and they advised it would not be refunded. My account says I have until November 12th to make the remaining $0.34 or I could be disconnected. So, I'm not on automatic payments and have a month until I face a disconnection, and you felt you could process a payment I did not authorize? Disgusting.