cancel my plan

Prepaid:
Remove any auto-pay, and stop paying it and it will cancel itself after 90 days of non-payment.

Postpaid and you are living in Canada:
You can schedule a callback here: https://www.koodomobile.com/en/help

Postpaid plan and you now live outside of Canada:
You can reach out to Koodo via facebook or twitter, using the respective logos at the bottom of this page.

If we remove auto- pay and stop paying and also stops using the services.  The amount do get accumulated. 
Do we have to pay for those 90 days?

Hi there,

So if you are referring too the prepaid service then no. Once you reach the end of your usual 30 day period, the account gets suspended. It will then wait 90 days to be topped up again, and if it isn't, the account closes. You will not owe any money for waiting that 90 day period.

Which of the services do you have? Once you figure that out, you can follow Allan's instructions above. 🙂👍