Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Calphalon Warranty is Bogus - Buyer Beware

I received a set of Calphalon pots several years ago. The outside surface scratches easily and requires a special cleaner. The pots also got worn away by repeated washings and are not dishwasher safe. Though the company claims to have a 10-year warranty, when I returned the pots due to my dissatisfaction, they didn't provide a store credit or a replacement set. In fact, Calphalon just sent them back to me. Even manager Tony didn't come through. I strongly recommend against this company and their products - their customer service was atrocious and their product is too difficult to maintain for everyday people's use.