Bad after sales service

I bought a car in 2013 and was promised a spare key because the previous owner had not brought the spare key back. Lindiwe eventually told me that they will cut a spare key, yet upon numerous follow ups on my part i still don't have one. Lindiwe NEVER DOES A FOLLOW UP. When you ask to speak to someone else they tell you it was not their deal, the manager also never calls back so two years later i cant get a spare key because \the deal is old"Last month the one key i had stopped working"