Lane keeping function stopped working, but not covered by warranty plan???!!

I have my Supra purchased in Novemeber 2020, in December the Lane keeping function stopped working, I sent my car in to Monument Toyota Constantia for repair. They suspensed the problem is caused by the windscreen replacement done by a supplier appointed by my insurer, but Toyota cannot provide me with any evidence or report to state this for me to go back to my insurer, instead, they ask me to pay the repair upfront myself, because this issue is not covered by the warranty plan??? This is the worst experience I ever encountered with any dealer in the past 10 years, my car is sitting in their service department for 2 weeks now with no further arrangemen. It seems they want to blam the windscreen without have any kind of confirmation of the cause. How a electronic part can be broken within 2 month normal and very little driving??? this is a factory faulty to me, and Toyota just want to get away with it??