HYUNDAI NO MORE

I bought my 2014 Hyundai i20 2 years ago.I called Hyundai Boksburg warranty department a couple of days later to enquire about the warranty since the previous owner failed to have the 45000 km service done.When i bought the car it had 63000 km on the clock.The car had its 60000 km service done.The warranty lady at Boksburg branch ensured me that my car's warranty was valid since it had the 60000 km service done.I since had the 75000,90000,105000 and the last 120000 services done.A week before i took my car for the 120000 service the heater box started leaking inside the car.When i asked if it would be coverd by my warranty i was told it would not because my car did not go for its 45000 service. Warranty or not how can a heater box leak after only 4 years??? I need to upgrade my car in 8 months time and really wanted a tucson but i dont know if i would upgrde to a Hyundai anymore!!!