I've had my phone for a couple of years and my due date to refill my time was Aug 24. Last year I added unlimited texting on auto pay. I knew I was getting close to my refill time for my minutes but now the date says Sept. 13 for texting auto pay. If I pay my $100. now am I going to get zapped for another $100 on Sept 13 or will they just take $110. on Sept 13 for both my fees. Help please.