Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy "3-Pack"

The product itself performs satisfactory, but beware of the seller sending only 1 bottle, instead of the promised 3. After complaining, they sent a 2nd bottle...and after complaining again I was refunded $6 to my account for the never received 3rd bottle. I don't believe a 3-pack exists, but the seller assumes you will not bother to complain about getting only 1 bottle despite paying $20. They were wrong in my case. Hope this helps!