Thank you for your question. What you are saying is both correct and incorrect. It is correct that remolding service is offered for 150€ by Custom Art when the IEM's were not made by Custom Art.
However, as in the present case, when the CIEMs are from Custom Art, what you will be performing is not a remolding service, but a "change of ownership" service, which costs 75€. You can check it on Custom Art's order page :