Bad service

I bought a car last year August from a lady called Keegan however I did not get my spare key I have calling the dealership consistently regarding the spare key and they have been telling me that that they will look for the key however nothing or nobody is getting back to me regarding my car key. I even went as far as when going to service my car to ask about the key and it’s always the same story. I need that spare key as the one I have seems to be not working properly