If your supplier doesn't want to exchange the CPU (Find another more trustworthy supplier) try opening a AMD Warranty Request from here: AMD Warranty Request Form | AMD .
Explain to them what occurred plus include the Receipt and photos of both the Box the processor came in plus the CPU processor.
Here is how to fill out the AMD Warranty Request:
NOTE: Did the box look like it was tampered with? Possibly someone replaced the original more expensive Processor with the cheaper 1st generation processor before sending it to you.