price increased ?

Sure this is how to contact the support

and this is the communication, therefore, the price changed on the 17th

https://fizz.ca/en/faq/important-information-mobile-members-who-subscribed-october-17-2019

To contact the support you need to go to this page https://fizz.ca/en/contact-us, Fizz push you to find your solution, therefore, you need to search in the solution hub to your solution and only after 10 seconds that you are in a solution page Fizz will give you the chat bubble.

CHAT

• Go to this page https://fizz.ca/en/faq/im-unable-log-my-fizz-account-what-do-i-do, if you are not connect login
  
• The business hours: every day from 8 a.m. to 9 p.m. (EST).
• Wait 5 seconds for the bubble icon to appear at the bottom right of the browser and click on the icon to chat with support. Try a different browser if you have issues getting the bubble to appear.

If the chat bubble does not appear, this means that the number of sessions waiting for our answers surpasses our processing capacity. If that happens, send us a private message via Facebook Messenger or Twitter.

FACEBOOK

Your can also send a message via facebook messanger https://facebook.com/fizzca and click send a message (this is a bit slower)

CONTACT FORM

You can also fill a contact form from your account Once logged in, from the account panel go to My Profile → Contact Form (the subject are limited) and fill out the form and someone will email you back.

Bracha,
Try to contact Fizz by Facebook: (it's rapid and easy)
https://facebook.com/fizz.ca/ click Send Message

Most probably something was not counted in when you were reviewing the price initially, sometimes it takes time to update to see the right price. 19.80 it sounds near the very bottom of launching prices.
I don’t know which plan you tried to set up, but you need to contact fizz to see if anything can be done or what is the reason for such difference.