Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad product, bad service

I had ordered two containers of this root killer product a few months ago, and planning to use it as directed, which involves applying the product when you won't use the water/sewer for at least 24 hours. When that moment arrived, I opened the bottle to find that the product had congealed and hardened. I contacted the seller, who informed that because the order was over two months old, they were not "authorized" to advise me on whether the product was still useful, or should be returned, etc. So, I'm out $$ and time, have no product to use, and have a hazardous product to dispose of to boot.I think that Amazon usually does a great job of customer service, but if their partners can not provide any service, Amazon would be well advised to drop them.