Absolutely useless Service and never has stock

I bought 2 brand new TATA 207 DI bakkies for my business. Since then, everytime it has gone for a server at TATA Wonderboom they keep the vehicles for more than a week. recently i grew fed up with this. Now i refuse to let them keep it overnight. a few weeks ago, I got it back from a server and it was leaking oil like crazy, they said that they may have damaged something in the service. so I booked it in again. 2 days later, they tell me that they dont have the part and that they need to order it (which they ALWAYS need to do. Never stock on hand). I told them that im not leaving the vehicle there and that i will drive it with an oil leak. 3 weeks later, they tell me that they have the part and that i should bring it in today 27/02/2018. I dont hear anything all day from anyone.... So i send my driver to collect the vehicle. They havent done anything all day and tell my driver that it was the wrong part..... Nowhere the whole day did anyone bother to call me and tell me that they have the wrong part and that i can come collect the vehicle. I wonder if anyone ever would have..... this Dealer is in the perfect area (WONDERboom, because you wonder whats going. Worst Service I have ever recieved from any dealership. I will never in my life buy or recommend TATA to anyone EVER.