If there is any information on the Amazon site that speaks to product specifications contrary to the actual product you received, just start sending emails to Amazon customer service with details escalating the issue (reasonable emails, but with a slightly angry customer tone). Their CSRs are somewhere overseas, and you get a lot of variability in the responses. Often a first response looks like they did not even read the email or they just say no - regardless of the request. But if you have a legitimate case, eventually you will get someone who offers to correct the situation. I order a lot of stuff from Amazon - have had issues every now and then - they have always taken care of things once I get the right person.

If you just waited too long to return it, and have no buyer protection, then charge-back is probably your only option.