Hyundai Motor India — Engine light issue, disappointing behaviour

My car got repaired few days back at a Hyundai authorised service station. The mobil oil had leaked and they had repaired it. My car is in Extended warranty And after a few days now, a sign was appearing in the meter and I went back to check as what the problem was. They told me that the oil cooler needs to be replaced. I further questioned about if it was available in the extended warranty scheme and no response was shown by the staff. I am disappointed with this kind of behaviour.