I think it's more like contacting the corporate offices of McDonald's about the missing fries. Yeah, they're not going to get involved over a single order, but if there are persistent problems with the delivery of fries in a given area, someone's going to investigate the issue.

In this case our reps can demand answers from Luis dejoy about why there have been persistent problems in parts of this state. If the problem is "not enough staff" then they can demand a plan for addressing the shortage. They can haul his butt before congress to testify. If needed they can sponsor legislation to increase funding for the post office. I'm sure there are other things they can do that I'm not aware of, what I do know is they are not powerless to affect change.

I also know that they won't do anything if they don't know about the problem in the first place.