I made two purchases to a same seller in China, which never arrived and doesn't want to refund!

[romero.marco.a]

I made two purchases to a same seller in China (Google Cardboard Lenses), which were ordered on Mar 07, 2017, which never arrived.

Additionally it was never possible to identify the shipment with the tracking number supplied: LK158503335CN

It is noteworthy that despite having requested the cancellation of the first purchase which the seller initially denied (and already was charged by PayPal), it was supposed to sent it in the same package which never arrived, and whose tracking never worked.

Unfortunately I had no choice but to request the refund of my money corresponding to both purchases, but more than a week ago I'm waiting for the seller to respond, after requested in 3 previous times to refund my money in the "Resolution Center".

I honestly I don't know what else to do, the "Resolution Center" system has stalled waiting for the seller's reply that has become clear that he is a scammer.

Is there anyone who can help me?