Car service

I'm still fuming about my experience with Hyundai Woodmead. Last year, I took my 2023 Hyundai i10 Motion in for a 30,000km service and was charged R3400. Fast forward to this year, I had the same car serviced at Hyundai Vereeniging at 45,000kmeand was charged R3088. What's puzzling is that the second service, which covered a higher mileage, cost less than the first. I'd appreciate it if someone could help me understand the discrepancy. It's frustrating to feel like we're being taken advantage of, and I believe it's essential to speak up. If they wish to contact me,my email address is lmamohlolo@gmail.com as am currently overseas.