Poor service

Renault south africa since I can't get hold of Renault heidelberg. Bought my Renault with a non working spare key. A year and 6 months later I notice one tire on my car is very badly worn. Took it to a local wheel alignment shop they said I need to contact Renault since the car is still under warrantee etc they should sort this problem out. So I have a problem with my suspension I don't know for how long now coz I only saw recently one tire only is very badly worn. Now the salesman is ignoring me and I can't get hold of anyone at Renault heidelberg.

No spare key since buying the car. And maybe a life threatening issue on my suspension.

No answer at Renault heidelberg. Salesman ignores me. What am I to do.

Wish I never bought this car. Very bad service