Cannot connect to voicemail and text message disappearance ?

Try to restart the phone, it seems a problem with your phone
Fizz cannot cancel the SMS from your phone.

Very odd indeed, no issues on my side. Have you tried contacting Customer Service via chat? I think this must be an issue specific to your account...
Hope you can solve this soon!

As Gabo said this is very stange,

To see a list of all your Fizz transactions. to check that you have the voicemail

- Go to My Plans in your Fizz account.
- If you have more than one plan, choose the plan you wish to see transactions for.
- Scroll to the bottom of the usage summary and click on Transaction history.
try to contact the support, here we are users

Try with this instructions, I tried now and I was able to have the chat bubble.
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- Go to this page https://fizz.ca/en/faq/how-can-I-access-and-use-my-voicemail, 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.
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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.