My father gave a wrong phone number of the recipient in China , so the parcel is not delivered and it is stuck at Guangzhou custom. What should I do? Who should I contact?

hello! my parcel CR925888462SG has been held in custom for almost a month now. item cleared shanghai customs but not the one in guangzhou. parcel has also been previously sent to me as the parcel i am sending back is a return parcel from taobao. what should i do? have asked recipient to contact custom but there is no reply yet.

Hello,
I’ve sent a parcel in august from Uk, via Royal Mail, the parcel is now stuck at custom and I don’t know the reason, the receiver refuses to contact the custom to find out, tracking number is RN428183640GB. Could you please assist and let me know what is the problem?
Thank you