Your best chance is to chat with the support team.
Go to the Help secrtion in the web site or in the app and start a chat via the chat bubble at the bottom right in the page
You can try this also:
Thank you for opening this thread.
Please note that
for the installation you don’t need to be in person at home. Any
18+ person can be there to welcome our technician.
In case no
one can, you can rechedule the appointment from your account by going
at: My plans → Manage my plan → Installations. In this menu you
can see the time slot of your appointment and you have the option to
reschedule for another day (You will see a calendar live updated with
free slots, same visibility as we have over the the appointments of
our technicians. Don’t be afraid to verify, your current date won’t
be lost if you won’t finish the process by selecting a new
If you have other questions you can contact us anytime in
private from this link: https://fizz.ca/en/support
wish you a great day,