Just file dispute now.

Make sure you say "item not as described". It's like the cheat code to eBay customer service. And it's accurate. The item you got is not what was described in the listing.

If they offer to send you another whatever you ordered, say no or the scam will reset itself. And it's REALLY hard to file a second dispute when they pull the same stunt again. That scam is that they say they'll send you another if you close the dispute. So you do, and then they send you another empty package that costs them next to nothing because for some odd reason the USPS gives special insanely discounted postage rates to Chinese merchants, making this scam easy and cheap for the scammers. Now your dispute is closed and there will be another 'package delivered' tracking notice. And it's near impossible to reopen a closed dispute.

Don't bother arguing with the scammer. Screw them. They know all the tricks to delay this. Open the dispute. Get eBay to refund you. Leave negative feedback. Walk away.

The seller's account will get shut down after too many of those, then they'll open a brand new one with a few thousand fake feedbacks.