I suggest you provide the raw material from now on or find a new mint.
Thanks
From what I gathered they weren't using a real "mint" to begin with. It sounds like it was a shareholders Metalworking company most likely used under the basis of keeping profits high without utilizing a real mint.
The mint we have used so far is actually quite inexperienced in making coins, their primary business is in other type of metal making. Not coins per se. We've used them because of good connections and pricing, the owner of the business is a shareholder in our company.
I don't think it's fair to your customers to keep producing coins from that location either, especially pre-order coins where the quality is expected to be extremely high.