If your NETFILE account is locked, then you'll need to contact the Canada Revenue Agency (CRA) to unlock it. 

If you are in Canada or the United States, you can call the CRA at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency

Once it’s unlocked, let us know what the exact error message is that you are getting when you try to NETFILE. If you would like to contact our phone support team, you can call them at 1-888-829-8608.