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The most effective way I've seen customers reverse an action, is to export the campaign results and then manipulate it in Excel to be a list they can import to correct the values. If you made the change by selecting leads in a smart list and clicking Lead Actions, a link to the background campaign should be in their activity log.
I would also recommend blocking Acquisition Program from updates in Admin > Field Management (after you've corrected them) to prevent this from happening again in the future.
The most effective way I've seen customers reverse an action, is to export the campaign results and then manipulate it in Excel to be a list they can import to correct the values. If you made the change by selecting leads in a smart list and clicking Lead Actions, a link to the background campaign should be in their activity log.
I would also recommend blocking Acquisition Program from updates in Admin > Field Management (after you've corrected them) to prevent this from happening again in the future.