coackroack

my flat is in 11the floor,but a coackroack appreared twice last week for the 1 st time.
i witnessed several times at the entrancehall at grandfloor,it chased someone ,took elevator to the 11th floor,and entered the room wiht one of my familly.
to tackled it, i used waapons the pesticide spray, it got weaker then an electricy racket finished!
but they probably do nothing,just hiding bihind the frigde or somewhere in the corner.
it moves very fast and sudden appearig surprises us.