It's incredibly hard to protect against this, especially when it comes to digital items/services.
People could use stolen PayPal accounts or credit card information and you stand no chance.
https://www.paypal.com/us/webapps/mp...ler-protection
Quote:
We cover physical goods (not digital items or services) that are sold and shipped with proof of delivery from within the United States to buyers around the globe.
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Best thing you can do is refund payment/accept liability. If you receive an increasing amount of chargebacks and you wait for PayPal to make a decision on the case, you could get your account frozen/closed.