I would say talk to the person they report to. If that's not an option for some reason, tread cautiously. You need to provide specific examples and how it impac

I would say talk to the person they report to. If that's not an option for some reason, tread cautiously. You need to provide specific examples and how it impacted you and the organization. "Hey, the other day when you forced pushed over my code, that was not fun. I lost a day's worth of work and it impacted the team." If you can't back up what you're saying with concrete examples, you will be ignored.