You Can Tell A German (but you can't tell them much)

Consider yourselves lucky; this is the condensed version.
About 4 months ago I placed an order for 2 pieces of glassware "x-7" and two pieces of glassware "x-8." When the package arrived it contained a piece of glassware "x-9" in a box marked glassware "x-8", and a piece of glassware "x-7" in a box marked glassware "x-8." I called the vendor and they got me in touch with the manufacturer. The German manufacturer stopped just short of calling me a liar and refused to correct the shortage and wrong part. The vendor agreed to send the correct pieces.
When THAT package arrived it contained ONE correct x-8 in a boxe marked glassware x-8and a x-7 in a box for the x-8. We now had both x-7 parts, and ONE good X-8, but still needed the other x-8. Another conversation with the manufacturer, where I indicated the boxes were mislabeled. I was quickly informed that we got EXACTLY what we ordered and I was wrong. The vendor tried again. AGAIN we got two x-7s in boxes labeled x-8. Months later and we now have a manufacturer rep. Today the manufacturer rep called me to introduce himself and let me know to call the manufacturers customer service. I did so and was told the problem is that the boxes were mislabeled. (I'm glad they let me know) They also asked to work with the VENDOR rep and I gave them his number. The good news is that the manufacturer now understands that I have been right all along. They just have to correct the problem and get me what I need.