lost packet

Hi, I bought a grill from Multiple Manufacturers on January 22, supposedly I arrived at an incomplete address on January 25, not at the address provided by my Amazon, this order was going to be shipped to Panama, it turns out that it was delivered to another person, how do I communicate with the Seller? According to the tracing of the packet it says that it was sent by a company called Keystone, or something like that .. I need to contact the seller.

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