This scenario is unfortunately commun with customs. Unless all your documents are complete and all your taxes are paid, your shipment will get stuck. First you’ll need to check with your carrier and make sure there are no unpaid taxes. If you come across unpaid taxes, pay them. If that doesn't work, you should contact your shipper to verify the documents. If any of these documents are missing, customs will either immediately reject the consignment and ask it to be sent back to source or hold the shipment for a set period of time to allow the Shipper to submit the documents. Storage charges will be charged during this period.