Car service

I bought a new grand i10 2023 July, I took my car for it's 1st service last year 2024 and i was told i brought it in to soon, i must bring it in when it's on 15000km, Now it's in 15300km, i am told that i must pay R2700 for service because i didn't bring it in for service and it has a service plan.

I don't have the R2700.