You can wait until you get the Notice Of Assessment, then use REFILE to fix the return you sent, or you can try contacting the CRA and see if they can cancel the return.
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
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