You will need to submit a ticket here:
https://support.fongo.com/hc/en-us/requests/new.
For the issue type, select VoIP Unlock Key-->Billing and Payment Inquiry.
I suggest providing them with your original email address, invoice #s, etc., and anything else that may be helpful to locate your VoIP
Unlock key purchase.
If you do not receive an automated response email with a ticket number after submitting a ticket, check your email spam folder.
If no responds to your support ticket, provide the ticket number in a private message to Fongo Support:
ucp.php?i=pm&mode=compose&u=7852.
I would allow up to 48 hours for a response.
Also, ensure that you're logging into the right FPL account at
https://www.freephoneline.ca/showSipSettings.
If your ATA or IP phone is still registering with FPL's server (and if you are able to receive calls), then it stands to reason that your VoIP unlock key still works.
These are user to user support forums, and Freephoneline support is not obliged to respond here. Moderators
do not have access to your account information either. So you will have to deal with this issue via ticket submission.