Done - no longer asking for help as there is none - thanks
Hi there. Terribly sorry to hear about your experience, but always please open a Support Ticket via Envato Help and Support in case an author isn’t replying to a refund request. They will always be more than happy to help. Please reach out to Envato Help and Support for this, and they’ll get back to you shortly.
I already sent Envato a message about a refund. NO ANSWER
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Envato Support has a tone of tickets, as the community has well over 1 million active members. They always reply back, it can take up to 48 hours. Your patience is appreciated. Cheers! 
Be patient, Support inquiries can take a few days to be replied.
Not sure what do you mean by “a duplicate purchase with a key that was broken”. If you’ve purchased the same item twice, that’s your fault, and you should assume it.
By doing a charge-back, you’ve forcefully took the money away from the seller, and as a security measure, Envato has disabled your account: https://help.market.envato.com/hc/en-us/articles/204010880-PayPal-Disputes-And-Chargebacks