I'm seeing a perfect porno plot, where A (client) and B (copper maker) take some rounds making initial complaint irrelevant, or even a reminder of sexual conquest.

A: Your copper sucks. I ought to make everyone know that!

B: And what would you do? (They slowly undress and walk around as A tries to collect themself and both continue to speak)

A: I would, hem, I would put it into clay and put it everywhere, in marketplaces, on central streets.

B: You would? Ho-ho, how strong is that? Who would read that?

A: People! They'd see. They'd know!

B: Scrap that shit. I'm here, before you. What would you say to me, punk?

A: I'm... I...

B: What if I say that I intentionally sold you a shitty batch? (From behind, they put a fingernail on A's cheek) Because I knew you won't do anything about it. Like I own my copper, I own you.

(They put one hand on A's mouth and the other hand on A's trousers)

B: Copper comes and goes, but I would teach you, for once, how not to be a little whiny pushover. You'd learn how to demand as you have any right to do. But first you'd supply this sweaty ass to pay for it.

(Then, they had a wast amount of sex, starting with a B-dom hatefuck, but over time it came to the comfy A-centric pleasure when B cheered them on doing it, choosing the position they'd like, commanding speed of their breeding. A took the control of the whole process and for once felt like they are the boss of their own life. As A felt exhausted and fell asleep right in a generously genital-sauced sheets, B get up and put a complain tablet in their secret cabinet)

B: Another day, another happy customer.

They giggle, and the scene fades to black.