I got new potentiometers from musikding without an email reply. They were 16mm and not 9mm. This is the worst consumer experience I've had in perhaps decades.
I'm not really sure what you want me to do in this situation. I supply PCBs to Musikding, that is it. He is responsible for everything else provided in the kit. You purchased the kit from Musikding. I could reach out to Klaus on your behalf, or I would be happy to help you source the correct parts, but I do not and never have offer part kits for these projects. I'm sorry you're having this experience, but I don't know what you expect from me.