Very angry client

Very angry with innovation, took my vehicle for service 4 weeks ago, before reaching dealership the water pipe burst, which caused engine to overheat and damaged engine. Vehicle is still at dealership because engine needs to be replaced, they approved a sum as replacement, I have to pay the rest ( approx R45 000), after replacing new engine the dealership noticed that there is additional damage to the turbo and clutch cilinder, I am covered for those parts on my extended warranty, but they don't want to pay out, because the engine is the primary part, why list so many parts that are covered but when it comes to claiming they have so many excuses .