Big problem with Maverick

Hello together, I have a huge problem with my Ford Maverick Highclass 2.0 Built. 2003 (91kw/124 hp) My car is 4 years old and was leased. 2 months ago I took the car from the leasing. At the weekend I wanted to go shopping with child and cone, where the car went out during the ride and did not sprang up. After I towed the car into the Ford workshop, I was informed on Monday that the crankshaft sensor was defective (abschipped) and On Tuesday, I was informed that the new sensor would not fit because it would grind at the crankshaft (or flywheel). The workshop manager told me that the crankshaft had too much play and they didn’t know why. However, he had already made a corresponding request to Ford, where this error was unknown. Today, I was informed that there was probably only the possibility to renew the engine block. The car ran until the Woc All inspections have always been carried out. The car has about 100,000 km on the speedometer. Can it really be that it is such a large defect (after only 100,000 km) AND would not have had to announce such damage by noises ect.. I have some kind of doubt about it. Maybe someone knows about it here or had a similar problem. Thanks in advance… Nemo