Unprofessional Service

I've been a customer of Xfinity for many years. However within last 2yrs had been Approved for both Essentials & Affordable Connectivity. Now Xfinity is threatening to DISCONNECT me for "Non-Payment over $100. I SHOULDN'T even owe a bill not a single dollar. They should owe me for harassment pain and suffering. My internet is free!! Plus I've made multiple payments when I shouldn't have. After 21 years of marriage I recently became a single mother of 4 Teenagers. I deserve better than unprofessional humiliating downgrading service.