Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Incomplete order

Vender negelected to send serial number tag with item. I contacted him and he sent a photograph of it. I was able to register and use the product, but I paid for the tag, which goes with the disc and again contacted the seller to ask him to send it. He replied that it was coming via "snail mail", but I never received it. Am still waiting. Could Amazon look into this? I have been a good customer. Thanks.