From Joy to Fury!!!

Took delivery  of 2021 Ford Focus automatic,  Friday morning. Immaculate inside and out. Didn't notice till gone 7pm happened to look out, thought I was bloody seeing things. Seemingly a new number plate was ADDED WHY?? I cant imagine instead of YR it was YD!!! TRIED SALESMAN, HE CANCELLED MY CALL. They don't open till 9am today, to think I drove a strange car home with false number plates... Where does that leave me with new insurance. This altered registration no is taxed to a Toyota! !!