Yes, you need to wait for your NOA before you can ReFile. 

If you received a NETFILE confirmation number when you filed and you still haven't heard from the CRA, you should contact them and ask what your return's status is.

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