Hyundai Motor India — hyundai service center asking for money even car is in warranty

Hi sir/madam,
I have bought hyundai xcent in 2018,

On 27th, sep 2019, while i was going out of station from my home, suddenly there was engine problem and we attached my car with another vehicle and brought to near by hyundai service center in kota.

I have given my car to "kamal hyundai service center kota rajasthan" for engine problem on 27 th sept, 2019.
Now once car is repaired and i asked to deliver, kamal hyundai manager is asking for the 30% amount without any genuine reason, even car is in warranty period.

Request you to assist asap, because it is diwali time and we have to go to our home town.