I've been and am still waiting for my parcel

Hi, My Tracking # is RS668039638CN. This item left the seller's office in Hong Kong via China Post, on 6/9/2017 and the China Post tracking system shows that the item left Shanghai/Pudong port on 6/12/2017 (Heading to California, USA?). The tracking status says "2017-06-12 11:49 Shanghai Pudong, left" and did not change at all since then. Of course I have not received the package yet. It's 2 months since the package left seller's facility.
Your web page (this web) indicates maximum 2 months, regardless, and normally 30 days shipping time.
What's happening to my item? Please advise ASAP.