It is depend you want make thing worst or "close 1 eye".
If the branch manager come or not come also won't interrupt the business daily operation, then just ignore it.
If you want make thing worst, here is something you can do:-
Since your HR department won't communicate with lower staff. Try to email them. Every HR got it own email for recruitment or other work.
After email them or you can't email them, try to find few co-worker and go to the HR department. Direct face to face stated the matter.
If your HR department refuse to see you all, then go to your boss or someone higher position (your branch manager head).
The worst scenario may lead to termination of your branch manager. If he still survive then the die 1 may be you since he is your head. So don't do thing by your own, find more people. More people = more secure you are.