Unfortunately, you can’t return once the return period has passed. you could however try to troubleshoot it and reset to its default factory settings to see if the phone can be fixed.

If the phone had issue with hardware, you could as well proceed with repair either with Koodo or samsung.

Hi there,

So you're past the return period. If the device was bought in a store outright, normally it is non-refundable once opened. Besides that, even if purchased on a tab, you have 15 days to return the device to a store with the receipt or if online 30 days. I'm afraid you're stuck with the device or you can sell it and purchase another.

https://www.koodomobile.com/en/help/returning-or-exchanging-your-koodo-phone