@flepore You have to login to My Account, update the card and make a manual payment
1. Update the card:
Go to Payment Tab, click Manage my card and then Replace this credit card:
https://selfserve.publicmobile.ca/Overview/payment/Make-a-Payment/
2. Make a manual payment.
After the new card info is entered, go back to Payment, One time payment, then use the option "Other (Enter the desired payment amount)" and then manually enter the plan amount and submit
Once payment is made, click the button "Reactivate current plan" if the button is there.
Then logoff from My Account and Reboot the phone