Cancelled vehicle service without notifying

So, took in my Suzuki Jimny for service this morning to Suzuki Centurion, after phoning them in January, and was told that I need to bring in the vehicle for service before it reaches 30000km - vehicle is currently on 29000km.

I was told that my 30000km service is cancelled as it 5 months over due and now I need to pay cash, bear in mind, I did phone in in Jan and also phoned in before booking in the car - I could have been advised on the call when making the booking that my service is cancelled but no, they scheduled the service just to tell me to pay cash after booking in the vehicle.

What a money making scheme, this is my first Suzuki and will be my last.

Spoke to Suzuki SA and they can not even waiver a simple service for a client!