Shipment delayed

Hi there<br> <br> I have my shipment that has been at customs for almost 3 weeks now, ml they don't want to release my goods and I don't know what's hapenning, everyday I make about 20 calls and I am told that they waiting to complete the system that has taken about two weeks, my clients is cancelling the order of I don't deliver by Tuesday, please someone help with this, I have spoken to supervisors/managers and it seems like they don't have capacities to resolve my querie, please guys I am begging you guys on knees to release the goods,