fiat defects

My Fiat 500 cabriolet was in for his service at the Tokai dealership during the service it was discovered that there is an oil leak on the engine. the seal does not seal, there was a letter out to the dealerships regarding the oil leak, if your car is still under the warranty. we have not received a phone call or an email that was been sent to us regarding this problem, I am working in a car dealership and I know if there is a problem due to a factory problem the cars need to go back to the dealership to be repaired. there was a letter been sent by the workshop to fix this defect on the car, Fiat comes back to us, where we need to pay +- R 4000.00 in for the repairs and the sealer that need to be put on the car where Fiat SA will only pay 40 % of the sealer and will not payed for the repairs in the workshop if the car leak oil it means it is a design or a manufacturing defect on the car, that means that the manufactures need to repair and pay for that problem. This is the 2nd time that a warranty claim is declined by Fiat. first was my key that was damaged by the dealer and secondly it is a manufacturing problem and the manufacturers want the customer to pay for the defect. SOMETHING IS WRONG