Apple ID

I recently received a work phone which was set up by my employer with my work apple ID, work emails etc. I signed into my own personal ID, thinking it would keep the work email log-in etc but it didn't.

Long story short, I've logged back into my work apple ID & now my work email account has disappeared & I'm still left with all the apps/pics etc from my personal ID.

I've reset/erased all content & settings and logged back into my work ID. Same problem persists & it asks me to log into my personal apple ID if I try to open any of the apps which are still present. I'm wondering if there's a way to reset a phone back before a specific date or some way to sort the problem.