KTM Sportmotorcycle — 2017 KTM 1290 superduke frame broke

Hi
My 2017 1290 superduke broke a frame on 1 off the small pipes in frame cracked through. Bike has never been in an accident or even fallen over. Went to local dealer in South Africa (Centurion Branch) had a looked and said looked liked manufacturer fault. Bike had full service history with ktm till 2019 the after service history with another bike shop. Know dealer say ktm will pay 70 percent of frame and I have to pay the 30 percent and also have to pay the full amount for labour which is almost halve of total bill for a defect or inferior part not my fault? Please assist
Thanks
Daniel