POOR CUSTOMER SERVICE NISSAN SOUTH AFRICA

I have a Datsun Go+ which has 30000km, the rear left tyre is wearing very bad on the outside. I have been in contact with Nissan Customer Service (Emily Bourman). First she stated on an email that the tyres are not the make fitted to the vehicle. I email her photos of brand new vehicles fitted with the same make of tyres. Now the vehicle is at NTT Nissan Secunda, the service manager has already emailed that there is a fault with rear axle. There is excuses that the warranty manager is not at work??? to approve the repairs. What *** excuses form this woman. I am sure that there is more than one warranty managers that work for Nissan SA. This customer service is extermly POOR. Nissan SA please sort out CUSTOMER SERVICE AND THE WARRANTY DEPARTMENT.