Bests & Worsts Reviews from Amazon

I have bought this product on countless occassions without issue. I bought a pack last week, and one of the cans appears to have metallic, likely aluminum paste on the outside of the rim. This was not only scary but dangerous. I called Amazon who, other than refunding my 10 dollar purchase, had no idea what to say about it or what to do. I offered to speak to customer safety. They declined. I offered to share the photos. They declined. I have no idea how much of this I ingested, and how toxic it is (or was). But, that was largely irrelevant to Amazon who waits for its customers to post reviews like this before taking action.