I would recommend you check your NETFILE confirmation number to make sure you have submitted your return. The following link will assist you - How do I find my NETFILE confirmation number?
Also, you may want to review this link from the CRA on when to expect your refund. They generally give a refund within 2 weeks if you used NETFILE and 8 weeks if it's filed on a paper return. However due to Covid, there will be a delay, for paper return, it will take 10 to 12 weeks.
Since you filed your tax return in February, and you have confirmed that you have successfully NETFILED it, contact the CRA.
If you require further assistance please contact our phone support team or contact us directly on Facebook or Twitter.