Could you please confirm if you used NETFILE and whether you received the confirmation number? If you did not receive an email with a confirmation number, you most likely did not file your tax return.
You need to make sure your tax return was submitted. You would receive a NETFILE confirmation number once your income tax return is successfully transmitted to the Canada Revenue Agency. If it has been more than 4 weeks since you filed, you should contact the CRA at 1 800 959 8281.
The following is how you will submit your return using NetFile.