Hi can you assist me as my package is being held by customs and is missing an invoice, how can i get a copy of the the invoice.

I ordered a package from Pandabuy but the most recent update on the tracking page says; "Overseas import customs keep it for inspection (customs declaration form lost/not applicable)". I contacted the customer service from Pandabuy and he recommended me to contact the local carrier. Destination is the Netherlands. I would like to know why the package is not sent yet. Can you help me with this? I'm looking forward to your reaction!

Hi, my parcel tracking no. RC781391135SG has been held by customs. My local (Singapore) postal company said that reason is due to missing invoice of the item. They require the recipient to send them the invoice, but the recipient is a large corporation and seems unwilling to help me respond to customs, and instead sent me the e-invoice for me to forward it to China customs. However, I'm unable to contact China customs, is there any email I can send the invoice to so that they can help me forward my e-invoice to the customs for the release of my parcel? Pleaseee and thank you!