Autopay might fail for whatever reason. Most of the time it works as expected.
If your account is suspended and you have credit card on file with PM, log in and manually pay.
Log-in to My Account, select Payment, click on the One time Payment and try to manually pay with Amount Due option there. If it fails, then use the option "Other" and manually enter your plan amount. Service/plan should automatically reactivate.
And it will not hurt to, once payment is completed, to log-off and reboot the phone.
If it doesn't reactivate then go to the plans or usage page and click on the lost/stolen option. Suspend your service. Log-out/in. Resume your service. Your plan should automatically reactivate.
