GoPhone bill

My Gophone bill is due the 14th off each month, but I just got an alert from my online banking app that my account was charged today June 12th by ATT!! Why was my account charged 2 days before it was do?? Also according to my myATT app my monthly 1.5GB of 4G data still says I have 0KB of 1.5GB left for this month?

Please respond ASAP!