Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Didn't receive what I paid for from Dak Mart

I ordered this unit from Amazon, which was then fulfilled by DakMart. I ordered and paid for a new unit, but was sent a different, substandard used unit from DakMart. It wasn't the same model, didn't have the three Denon speakers (came with 2 Mission speakers?), had no DVD feature..... a dismal substitute. I tried to contact DakMart -- no one answers the phone, the automated operator answers - there is never a live operator on duty to route the calls, I left messages and e-mails to employees within the company.... no response. I suspect a "bait and switch" has occurred. DO NOT DO BUSINESS WITH DAKMART.