Here we are users, probably you should contact the support
Go to this page https://fizz.ca/en/contact-us.
Your can also send a message via facebook messanger https://facebook.com/fizzca and click send a message (this is a bit slower)
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.
When you want to use your phone when traveling you have two options
Only the USA has voice options.
If you bought a travel add on (data), it does not include sending texts. Do you have funds in your wallet?
If you are only trying to text, you do not need data roaming to be turned on. You may need to manually select the provider instead of relying on the automatic choice.
For receiving text messages you don't even need to have any money in your wallet, it should just work. I've had success in Peru, Belize, and USA.