OP, I've worked with some excellent gunsmiths, and I've worked with some utter clowns. Even the excellent ones occasionally make a mistake though. Especially when it's all verbal, and you ask for something that doesn't make sense to them in terms of how things are normally done.
The single best thing you can do in the future in working with any gunsmith, is to provide them with an itemized, point-by-point list of the work you need done. And go over it with them, line by line. The more you need done, the more important this is. It's essentially a pilot's checklist. You don't give them info so they can get it right, you give them the info in such a clear, itemized way they can't get it wrong. It's not a knock on them - it simply helps with shop processes.