That's a really bad snafu; forgotten case and a defective replacement. I'm tempted to conclude that someone in the service office just called the warehouse and told them to ship you a replacement unit without bothering to investigate the details of the original service request.
I can only imagine that it's quite frustrating for you given all the time that has passed and that will pass until the matter is finally taken care of. Let us know how the situation is resolved. You shouldn't have to pay for returning the defective replacement.
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