Sorry, where can we clearly see that the OP is using the cage?
I don't see why it's such a crime for the OP to try to use a different email to contact the seller when the seller has completely ignored their attempts to make contact. The OP isn't being unscrupulous here. They spent a LARGE amount of money on a cage that doesn't work, and the seller won't even respond to their inquiries.
The words "fraud" and "blackmail" are far too extreme for what is happening here, unless you're referring to the fraudulent advertisement of a cage that's supposed to work....
The pictures she posted in her profile show the cage is being used, it is fully decorated and includes food dishes with food in them.
I understand that $950 is a large amount of money for something that doesn't work. However it must work well enough to house her lizards. "Work" is subjective, if you claim it doesn't work then it shouldn't be used. Period.
We do not know anything other than what she is posting regarding her supposed contact with the seller and his supposed lack of response. If she came at me with aliases, threats and the you owe me attitude all the while using the cage she is complaining about being unusable and did not give me proof of the damage, I'd wait for it to play out, contact the credit card company with my side of the story and provide them with copies of this thread.
Actually, lying about your identity online is computer fraud. The coercion and blackmail are also evident in the statement where she will give the last number of the credit card and place an order if he does something (fix the track) for her. It's a crime because it is literally a crime.
Sending out a defective cage is not fraud, things happen in shipping, un packing and installation. I agree that if what is represented here is true of the seller than he needs to step up and make things right, but we do not know the full truth about either party's involvement. The only truth we do know is that the cage is being used in the photos posted. That doesn't scream "can't use my big expensive cage" to me.
I am looking at this from a legal standpoint. The buyer needs to provide proof that the cage is defective and cannot be used (so shouldn't have posted picture where it clearly is being used). Since the buyer is using the cage the seller needs to contact the buyer and arrange for a new track to be sent. The OP is being unscrupulous, the cage obviously works, so is making fraudulent statements.
I don't have a dog in this fight, so will bow out, but this type of situation is wrong all the way around; neither is handling it well.