Generally chargebacks are required to be filed within like a week of the product missing. If you charge them back though, they can and will file a complaint with paypal. Paypal/Ebay used to have a policy that any non-tangible sales would be charged back no questions asked because there was no way to verify you actually sent the customer anything, but I'm not sure if this only applies to Ebay, or even still exists.
Do note that Paypal charges fees to Ntreev/Playspan if you charge them back, and if they file complaints, showing where (Like it or not, on the internet, you are your IP) you breached their terms of service and got yourself banned of your own fault (Even if it wasn't you, but somebody in your household), and then if paypal agrees with them, you could be looking at having the chargeback reversed and being feed yourself, on top of paying the chargeback fees they incurred on your behalf.
I think the better course of action would just be either to wait it out (Ntreev only does permanent bans in the most extreme cases. Chances are the ban is only for 7/14/30 days), or figure out who in your household decided to be a hacker/swapper/cheater, and bring it up with them.