Get off case!
get off (one's) case
To stop bothering someone about something. Would you please get off my case? I'm not going to the interview, and that's final! My uncle has finally gotten off my case about helping him at the hardware store, thank goodness.
Get off someone's case!and Get off someone's back!
Fig. Inf. Leave someone alone!; Stop picking on someone! (Usually a command.) I'm tired of your criticism, Bill. Get off my case! Quit picking on her. Get off her back!