Bad advise and poor service Grand Central Motors

On the 2/6/2015 I booked my car for service at Grand Central as it had about 1200km before next service and was planning to drive to CT.The service advisor was Desigan Naidoo who did not say anything about the car not being due for service yet instead he was interested in selling me new tyres which I bought and now I doubt if the tyres really needed changing.In short my car was not serviced and had to be booked again for service B.On the 3/7/2015 the car went in for service B.Today when o looked at what was done they did service A instead of service B as per the car and now the car is due for service again in 15000km.This is not what Desigan and CJ said,they said in 8/2015 the settings for next service was supposed to be at 20000km.I have been **** to and treated like a fool as this two guys are selling me nonsense everytime i speak to them.This to me is nonsense and it seems as if they do not know what they are doing.I need answers and to be treated with dignity and not as a fool.How can the car require service B and then it gets serviced for A and the KM's set incorrectly.This guys are only interested in selling me an extension to the motor plan.