Very deceptive processes involved with disciplinary action, and blindsiding is common. It is extremely difficult to fit into the "cliques" and your manager will most likely NEVER have your back in any situation.
Whomever the accuser is, they are always right; and you neither get to face you r accuser or defend yourself.
I was "released" without ever being written up for anything, even though my attendance was flawless.
1 or 2 of my accountabilities wrote something negative on a client survey, and I was gone. No Performance Improvement Process; not even a week to get my business wrapped up. I was released at 10am on a Monday. By Noon, I was no longer an employee.
Awful treatment throughout uppoer management and leadership on the HR side. Some of them lived in other states and met me once or twice, yet their subjective impressions cost me my livelihood.
They even tried to block me from getting unemployment when I requested it: They lost, of course.