Answered question
I changed my plan from unlimited calls to no calls, because I wanted to add an add-on for calling as I do not need to call a lot. My plan changed, so I can't call now, but I also can't add the add-on for calling.. It's not allowing me to click on the options..
Use contact us form in "my profile" to create a complaint, someone will fix it.
Other answers
Go on this page https://fizz.ca/en/contact-us, if you are not connect login
Wait 15 seconds for the bubble icon to appear at the bottom right of the browser and click on the icon