Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Useless for me, AND arrogant customer service

I had a parade of ants traveling around the outside of my house, constantly. I laid down a good quantity of this stuff, across the path AND along it. The ants took no notice, either walking around it or through it. I never wiped it off, but it did nothing.I called Combat customer support and described my situation. The guy instantly started to look for ways to deny their "guaranteed to work" promise. When I said I left it on the house for a week and a half, he claimed that I had used the product "incorrectly" and said it would've killed the nest if I'd left it for 20 days!!!I was irate. These guys make an inferior product and they insult you to boot.