Like others have said, I would call my CC company and dispute the charges. As a buyer, they are goods and services that were not provided. It's not the sellers fault either. However, they are much more likely to help in the matter if they face a potential loss themselves. The sellers are choosing which companies to ship with. If this is how fedex is going to treat them, they have a choice to not use them anymore. If it's a large enough supplier, I would imagine FedEx would be much more concerned about this if it was risking a valuable contract. It's more about forcing these parties to the right solution then placing blame.

Maybe I'm crazy, but I wouldn't worry about my relationship with the seller. $200 is a lot of money to a lot of people. It sounds like you have been buying stuff from this company for a long time and have likely spent thousands of dollars on parts like the rest of us. You did not receive the goods and services that were paid for. The supplier should assume that you aren't lying based on your history. If getting your credit card involved for a legit reason is going to cause the supplier to ruin a thousand dollar relationship over a couple hundred, that's on them.