The record should be noted with why the downgrades occurred. No supervisor is going to manually downgrade your flights, especially all of them, without a reason. Was there a schedule change? Did you get rebooked on all flights for some reason?
Even if you called in and asked for a downgrade any agent would do it for you. They don't need a supervisor to do it.
There has to be more to the story here. Shenanigans?
-RM