No break for the HO.
I'm not going to badmoutn another EC for an honest mistake but if the guys a total hack then the HO's going to know about it.
Theres no way that the above scenario was just a mistake, he checked power at the WH, realized a leg was missing then starts changing breakers and leaves without the problem solved. After noticing one leg was missing at the WH he should have checked the breaker, he wouldve noticed the breaker is fine, the only thing that then leaves is an open splice or a cut wire.This is very basic troubleshooting, my apprentices would catch hell for doing this.
In my opinion, the first company there tried to pass off a green helper as an electrician.