How to revert the collector reassignment?

Hi Team,

Business user while trying to reassign a collector from "Manage resources" changed it to an incorrect collector. As a result, the collector assigned to customers have changed. PFB the detailed description.

One set of customers was tagged to NAB Collector name while other set was tagged to HB collector name. While performing some operation in Manage resources, User reassigned collector from NAB to HB. As a result, all the customers previously tagged to collector NAB have now been shifted to HB. They want to revert to old configuration.

Is there a way to revert this change?

Thanks & regards,