Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worst experience ever

The one piece sink vanity top I ordered from Amazon arrived in pieces because it was not well packed. I immediately notified the seller who said they had to have a picture before they could replace it. I sent a picture the next day which they acknowldged. I waited 10 days for a replacement and contacted the seller again when I didn't get one. Since then I have contacted them numerous times and after 6 weeks was told I had been sent a refund. I still have no sink, no refund, no credit to my account. I've never had an experience like this with anything I've bought online. I don't know what to do at this point.