I can't access my ATT Prepaid Account - I need to cancel AUTOPAY

Long story short - I switched providers. I ported my old # from ATT Prepaid to the new service I was using. This completely nixed ATT Prepaid and the SIM Card is no longer activated.

However, I did this BEFORE cancelling AUTOPAY. I can't login to my PREPAID Account (VIA The Phone # and Password option) to cancel auto pay, probably due to the # no longer being active.

Am I still going to be charged VIA Autopay?