@carniver First, try the account reset function here: https://selfserve.publicmobile.ca/forgot-password/.
If that fails, you will need to submit a ticket to the moderators.To get a ticket:
click "Contact us",
click "Submit ticket",
login manually if your username/password are not filled in,
click the drop down menu (in the white area),
pick the topic that fits your issue and follow the directions to submit it,
If none of the topics are correct click Other/Something Else until you reach the blank form
If you need your service right away, one option is to buy a payment voucher either online (recharge.com) or in store. Then you can load the voucher via dialling 611 on your phone.