My friend had a disagreement at work with a senior manager (his line manager's boss) as he'd asked his line manager for support with excessive workload and hadn't received any.
The senior manager poo poohed his concerns and said they had no time for people like him who weren't team players.
Friend objected to that statement and defended himself, pointing out the work over and above his duties that he'd done previously to help the business.
Eventually the senior manager stormed off. Now friend has been told by his line manager that the senior manager has lodged a grievance (saying friend was insubordinate) and an investigation needs to be held.
It will be conducted by another senior manager and a middle manager who will take notes.
Friend feels harassed/bullied, not sure what advice to give.