AM678948301CN this is my package number my package said successfully delivered but it doesn't tell me where it was delivered and it did not get delivered to me how do I get in contact with somebody to get my package

I had two orders arriving via China post to America and they both went to the wrong address. One went to Alaska and the other to Pennsylvania. When I live in Washington state ... I have confirmation receipt.... How? And why??? And now what ? The packages both were high valued electronic items...

Hi,
I placed this order from a seller via DHgate & it should have been delivered to my address 31 Archer Drive, Cheswick Green, Solihull, B90 4LG, UK, however it was delivered on 11th June via Royal Mail to a wrong address in UK, the seller has closed his store more than 2 weeks ago & I can not contact him by any means, I appreciate if you can help, at least I want to know if he has given you my address & accordingly it is the fault of Royal mail to deliver the parcel to a wrong address, or the seller gave you a wrong address & in that case, I can get refunded by DHgate.
Regards