Worst service received

I have a maintenance plan with liquid capital, when I purchased the car I was told by the sales consultant to make sure I bring it for 1st service when it is 15 000 km , as first time buyer I knew and kept that. I brought the car for 1sr service on the 16th January 2021 in Hyundai Pinetown , Liquid capital rejected to service the car . I went to Hyundai to understand what was happening , I was told that liquid capital rejected it and I was given the rejection reference . I called them spoke to Yohan , he said that there was no need for all the hustle me Hyundai Pinetown should have solved it with them , he said they will fix it , and asked I s wait for an hour , he spoke to the service consultant , after a while ,a consultant came and told me they have authorized for 30 000 km service they have refused the 15 000 km service. Could not believe and understand as I was told they will sort it out but to the consultant is told something else. I told them I need to speak to them first as they had even issued the authorization number for 30 000 km service. Their reason after communication, I have brought it in late ,as it's 15 000km / 1 year whichever comes first , I asked for a refund of the 1st service they refused and they said they will do 30 000 km early service. I took my car in for the early service ,they rejected it again and their reason was vehicles is early for service. I called with my airtime first spoke to Nthabiseng ,she told me that Hyundai logged for 15 000km instead of 30 000 km . Spoke to Hyundai and they logged again and told me they are rejecting it again even the first log was 30 000 km not 15000km . I called Liquid capital again spoke to Zeni she cut my call ,never bothered to call back .I have all the proofs . Liquid capital is taking advantage of me , I think it's because I'm a female and first time buyer.