pester someone about something—annoy a person by constantly referring to a specific matter:
- Mrs. Buster is always pestering me about which dress to wear, which card to send, what color pen to use on the card.
pester someone for something—trouble a person by continually asking for smth.:
- Inertia selling was the practice by which companies sent unsolicited goods, then pestered people for payment if they were not returned.