TNT Poor Service

I was contacted by tnt to notify me that my parcel had been stopped by customs. The representative requested certain paperwork from me, which I sent to him immediately. He told me that I would hear back no later than 5 working days. It is now the 3rd week since he contacted me. I call tnt every day for an update. All they say is " the item is with customs." No clarification, no update, no context no matter how much I plead for help. I have found tnt to be very unhelpful. They have made no attempt to help me resolve the issue and I do not know what else I can do to get my item. I will never use them again.