No spare key after months

I bought a Renault duster from Menlyn Multifranchise in July from Melta the sales lady. The spare key was missing and she told me she will have it sent to me.

After numerous calls to her and many false promises I still don't have the spare key. She has **** to me many times and told me she sent drivers with the key but this has never happened. Eventually I spoke to her manager and he told me there is no spare key and one will need to be ordered for me. So she was lying that whole time.

The manager has now also forgotten about me and never got back to me regarding this. When will I be receiving my spare key? It is fine to make your customers wait nearly 6 month?!