Lyndhurst Auto they still cant find my spare key

I have purchased a mini clubman 2008 model in April 2015 from Lyndhurst Auto . Upon purchasing the car we experienced problems, the car was smoking we returned the car and it stayed at Lyndhurst Auto for almost two weeks. We then received the car but the problem was not solved. We decided to take it to BMW Bruma and they managed to find a problem and replace the part at our own cost. Lyndhurst Auto gave us 2 sets of keys but the spare key was of a Mini Countryman not a Clubman. they promised us the correct keys since April 2015until we were told that the salesman no longer works there. On Saturday 17 October 2015 I locked the keys in the boot. I went to Lyndhurst auto on Monday 19 October 2015 to check if they cannot look for my spare keys. The manager told me that they cannot find the spare keys the ones they gave me are the wrong keys and there's nothing they can assist me with