Review Service Warranty rejected for 20 000KM

My newly purchased vehicle has reached 20 000 KM and it is due for a second minor service as it is under warranty. KIA Motors refused to service my vehicle despite of guaranteed warranty due to new terms and conditions recently established. See attached and below message from KIA SERVICE PROVIDER -LIQUID CAPITAL

"Good day, (CAS-********-Z4J8L1-OC********)
Please be advised as per manufacture specification, vehicle needs to be serviced every ******** km/ 12 months from the late service , whichever happens first.
Please be advised that the service was due on ******** km/ July 2022, whichever happens first.
Vehicle is late for service. "

Looking forward to hearing from you
Regards
Mr Vusi Johan Mathenjwa (********)