Appealing with the civil service commission

Hello, Has anybody have any experience with appealing a decision with the civil service commission? I just found out today that via Dcas that I was deemed ineligible for a civil service title that I had interviewed for with ACS a few months ago even though I was previously hired in that title last year through another agency but I had to leave due to family issues. Prior to me getting hired, I had went on several interviews for that title with different agencies including ACS and no one deemed me ineligible then? SMH anyway has anyone dealt with this before and what was your outcome and experience? Thank you