Grand Central Motors Poor service and Advise

02/06/15 my car bboked for service as it was due but was not serviced and i had to buy new set of tyres wich i doubt if i needed them.The excuse was it was not set correctly the last time it was serviced.The service advisor failed to tell my wife this and opted to keep the car the whole day giving us the inmpression it was being serviced.The manager apologised for poor comjunication and the car was booked again on the 3/07/15 and insteaad of being serviced for B service it was serviced for A and it is due again for service in 15000km's which is in contrary to what was said when i went to compalin the last time and the service to be done is B.Their only concern is selling me an extension to my motor plan.If i did not know a bit about cars this two guys would be taking me for a ride.If the car needs service B please do service B not A.The two guys said the next service according to MB is nomarlly set at 20000km's hence the car not being serviced in June as the Km's were set at 15000km's.I am now thinking this was just an excuse not to service my car and this is causing me an inconvenience as i have to plan around the car going in for service.This is poor and unacceptable.