Is it possible to Mass Delete Goals or roll back the Goal Plan - Manage Goal Scheduled Process?

Summary

A Performance Goal has been duplicated once assigned with a Goal Plan - Initial goal was incorrectly assigned as Medium Priority, New Goal Assigned as High Priority, end user now has duplicate goals.

Content

We have a generic goal as part of our goal plans, so that once the goal plan is assigned to the end user, there is a goal in there for the user to adhere to. Initially in 2016 there was a bug found, 'Bug 22908283 : Goal Priority Changed from High to Medium unexpectedly after Goal Plan assignment.'

This assigned a Medium priority Goal to our eligibility Profile instead of a High priority goal, now that the issue is fixed, the goal plan has assigned a High priority goal to the same and new employee population. this has resulted in the existing population now having two of the same goals, one Medium priority and one High.