20W Apple Charging Brick — still safe to use after *mishap*?

While removing my charging brick from the power outlet, a metal button slipped from my hand and went between the adapter (not fully removed) and the power socket—which was switched on at that time—resulting in a reasonably terrifying spark and my new 20W Apple Power adapter looking like this: I know it's probably hard, if not impossible, to ascertain whether the brick is still safe to use, but I want to ask nevertheless: **should I still use this to charge my iPhone 12**, or trouble my dad to buy me a new one? PS: The black powdery stuff appears to be from the button ---------- UPDATE: I examined the adapter a bit closer and there seems to be a circular patch of metal exposed on both *arms* which is complementary to the ones I see on the button.