I think def u can ask your contractor to rectify that.... that’s awful and not safe, the crack might getting bigger.
its either they have installed u a lousy door (material) / their workmanship is CMI
Sorry to ride on... which one is better, Kraus vs Blanco (Stainless Steel Series)?
Planning to get one from Amazon too, but with the GST (i'm planning to get Double Sink) the price is almost the same with Blanco from Hoe Kee.