I am a long-time ATT customer and don't know why my service is stopped. I'm at a loss. I signed a one-year contract with ATT a month ago and paid.

Don't get upset, but rather start acting. Immediately you need to call ATT U-verse customer support and find out what happened and try to solve the situation that has arisen. I advise you to contact the employees of this company through the att u verse customer service website . It will be much faster than by phone or email. Take care of your health.