Autopay fails every month

HI,

I have an  AT&T prepaid service with autopay enabled. I have been using this service for 2+ years.

I see that Autopay is failing every month. My service is interrupted till I make an additional payment in addition to the payment of my chosen plan.

I am asked to pay $12 extra every month.

What is happening? There is no way to raise this issue through my AT&T internet account.

This is plain extortion from the customers. AT&T advertises a price and then they demand you to pay extra for restoring the service.

Every month I am calling up the customer service.