Refusal to Pay For My Service

This year in May, I bought a used Hyundai i20 and I was told service is also covered— every 15km I should take it in, all will be good. However, to my horror, when my car due for service I was told by the dealership that liquid refused to pay and that I will have to pay cash.

Unfair and ********* behaviour. I will be lodging a case at the ombudsman of course.