They never supp**** me with a spare key!!!!

Hi, I have purchased a Kia Sportage in Nov 2013 and the dealership never gave me my spare key. I totally forgot about the key until a year later I was asked about it when I services my car. So I asked the dealership where is my key. They told me they would look into it. I got busy and they just never got back to me with the key. Now 2 years later I eventually was in the vicinity so I went there asking for when will I get my key. Their excuse now is it is a new Dealership manager and sales manager and no where on their records it indicates that I did or did not receive the key. They expect me now to pay half of the key to get the spare key. Should they be liable for the key as it was part of the original purchase and whether they are new stuff or not should supply me with the key?