Dispute over service plan

Got my H6 in August 2020 in Newcastle. I was told that I'll bring it in for service in 15000 km intervals. Brought it in June 2022 for the 15000 Kms service all went well. Waited for it to reach or almost reach the 30000 km then this Monday took it in as it is on 29800 and something. Left the car went to work only to be phoned and told that my service plan has expired, I retaliated but I haven't reached the next 15000 making it to 30000. As I was told on purchase and after the 1st service. Both the customer care of Haval SA and the dealership vehemently refused to consider my stance that all that I was told on purchasing the car and on the 1st service by the service centre was to bring in the car at 30000. This yearly story is new to my ears as even on the 1st service it was not done yearly as I only observed the kilometres as per advice by the dealership. In the Vryheid dealership I was then handed a R4600 quotation to service my car. They did not take in the fact that I was adviced in the Kms and even my service booklet blocks say the next service is 30000. I feel ****** of my service plan why would I not take in a car for a free service earlier had I had known I can.