Bad after sales service

When the car was purchased, a Honda Jazz, in Greenstone in 2011 we were given a spare key and told to put it in a safe place. Recently we have had problems with our main key and the spare key would not work or fit the car so we went to Honda Bedfordview as they had serviced the vehicle etc as Greenstone had closed down. Their initial reaction was that Bedfordview is not responsible as the car was not purchased from them. They would charge us R4000+ for a new key. After a few phone calls and visits they said that they could get a replacement key sorted out at a reduced cost of R2000+. They stated (Mark Stevenson) that No1 the vehicle was over 5 years old, No2 it was not their responsibility as we had signed for 2 keys when we bought the car. I am still in possession of the spare key which I was given with the original bar code and auto tag on it. My complaint is simple..... if Honda issued the incorrect key then it is your duty and responsibility to be ethical and not to evade the responsibility. All we want is a spare key which should have been issued to us from the start.