hi @ShelleyKim
new activation or existing subscriber?
PM payment system is glitchy sometimes
if for new activation, wait a day and try again
if existing and if your plan not expired or suspended yet and you still have time, please wait a day or even longer before you try again. When you try, try using both Incognito/private/secret mode on your browser and try with Public Mobile app (with Location Permission enabled)
but if your plan has already expired or you need to pay it very soon, then buy a voucher from Shoppers drug mart or Loblaws or No Frills and then load the voucher using *611 or My Account
This is the full list of retails that you can buy vouchers. Vouchers in some stores need to wait 24 hours, but vouchers from Shoppers and Loblaws can be redeemed immediately:
https://www.publicmobile.ca/en/payment-voucher
On top of physical stores, you can also buy online with extra service fess: buy from muskbird.com , ding.com , recharge.com
