This guide shows where to cancel Koodo (Mobility / Internet) in Canada, with links to official sources.
Koodo’s Service Terms state that if you cancel service, you remain responsible for charges up to the time service is cancelled, including any Koodo Tab balances, and recurring charges billed at the start of the billing cycle may be partially refunded for the unused portion.
For help contacting customer service, Koodo notes you can use Koodo Assist to book a callback.
If you have Koodo Internet, use their dedicated cancellation help article and confirm any equipment return requirements.