Constituents can be removed and re-added by Luminate Support. Before support can remove or reinstate constituents, an administrator in your organization will need to add the desired constituents to a group. You can do this either manually, or Create a Query to identify the constituents that need to be reinstated, or removed and add the Query results to a group. Put all constituents that are to be reinstated in to one group and all constituents that need to be removed in to another.
Contact Support and reference this article. Provide the name of the group (and the group ID if possible) that contains the constituents that are to be removed or reinstated.