I don't want to be a client no more

Hi Jacky

You need to unsubscribe

For the mobile
https://fizz.ca/en/faq/unsubscribe

For residential internet
https://fizz.ca/en/faq/how-do-i-unsubscribe-from-fizz-home-internet

Important: You have 15 days following the date you unsubscribe to return your Wi-Fi modem, or else you will be charged the amount of $150 (plus applicable taxes). Detailed instructions will follow.
https://fizz.ca/en/faq/how-do-i-return-my-wi-fi-modem

Sorry to see you leave. You just need to unsubscribe and the next month will not he charged.
Keep in mind that you will have to return your modem.