Last Friday I got a message 'Fido has received a request to transfer your telephone number to another Service Provider. ' I was on travel those days, I didn't do anything with my account and my number. Is there any chance to get my number back? so what to do.
Welcome to the community!
It sounds like you are a victim of the SIM-Swap scam, you should contact Fido right away and they can start an investigation and try to get your number back. You can reach out to Fido through any of the available methods listed here.
You should also contact all your financial institution that you use your phone number as 2-factor authentication and let them know so they can put measures into place to protect your money.
You can also make a report with the Canadian Anti-Fraud Centre, you can get more info here.