What i would do is a "leave me alone spell"
I would get a picture of the person and a white candle and sumthing to burn the picture in.
Ashes to Ashes, Dust To Dust
(while saying ''dust to dust'' put your hands (still in ok position) one by one at your sides. then say)
This I ask for is a must
(turning and putting hands in praying postion while saying''must'')
not a foot more, shall this fool set through these doors
(covering your eyes and sheilding your mouth say)
neither his/her name nor his/her face, ever be seen or
spoken around this place.
This I ask for with all my might,
that this fool shall
leave my sight.
So mote it be
(then burn the picture)