Crossword puzzle clue "worker who handles your case"

Worker who handles your case?

Worker who handles returns, briefly

Yell at your parents for not making the soup salty enough because your crush told you your mouth looks too funny to kiss, e.g.

Performed in a way that made your parents leave your school play in the middle of your solo :/

They work on a case-by-case basis

Something done on a case-by-case basis?

Ones working on a case-by-case basis?: Abbr.

___ case-by-case basis