customer published VBS express changes in main branch and now want to revert

Summary:

customer published VBS express changes in main branch and now want to revert:
Customer have done some pay slip changes for payroll module using VB Express mode and published it. We have already been working on ORC module since few weeks and now we see the changes customer published is there in Main branch and causing conflicts. We don't want to merge the changes as the customer is just trying out few page option and do not want these changes to migrate to other environment with our ORC changes.

How do we revert customer changes?

We see under environment we can delete the deployed build but will it revert the changes in Main branch?