Hey
@SkyMirage25,
Origin and EA support are the same thing, just to clarify.
Support is not able to grant heirlooms, so in this case they'd instead direct anyone affected to create a bug report as in the post above so it can be investigated.
This situation with some people completing the collection event without being granted Revenant's heirloom is on our radar and is being looked into, though we don't have further updates beyond that just yet. Thanks for the additional report there!