A Squelch is the normal step if you get reported by a lot of people. That is automatic and falls off after 24 hours unless a GM moves it to the Silence category or Suspension.
If you got 10 days then a GM did move you to the Silence system and/or if you got suspended it is for more than a single one time offense.
You did appeal and it was upheld…which seems to indicate it was not something simple or there is an account history.
Hopefully a Blue can shed some light on this for you.