KTM Sportmotorcycle — Defective engine

Address:

34387

My duke bike which was bought on 16/12/2014 with the vehicle identification number of vbkjuc401ec012456 has undergone repair in spormoto/turkey.
It has been noticed that it burned too much oil and water at 4.500 km and has been repaired under the warranty by supermoto. at 6000 km we have started to hear strange sounds coming from the engine and took the bike to spormoto again. we have been told that we left the engine without oil and that it was our own fault. are we paying 400 liras (150 euros) for a check up for nothing? they are dragging the quality of the brand downwards, these kind of problems happen always in turkey. how could it be that a bike make strange sounds at 6000 km and burn oil? i’m asking kindly for you to bring a solution to this problem. kind regards, talha elmas