Good barrel, poor coating - Agency Arms Mid Line Match Grade Drop-In Barrel, Fluted, Glock 19

Purchased this barrel new in the black DLC coating from OP. Looks great and runs well. No issues with jhp ammo. But after just 100 rounds through it you see excessive wear on the coating all over the barrel. This shouldn’t happen. I’ve used other DLC aftermarket barrels as well as a OEM and after 2000 rounds the appearance of wear is far less than the agency after 100 rounds. For what you pay this should happen. This should happen with barrels half this price. Sent an email to agency with pictures as well as made phone calls to customer service. No answer or reply yet. If they don’t reply by next week I will have to involve OP to resolve this. This is not acceptable for a barrel.