Package on out of delivery in Germany

I sent a package to Germany and it's showing out of delivery for 1week now, I told the buyer to contact Dutch post office; he is telling me no one could help him at the customer center were the packages is. He said he called more than 20times  staff  gave him an e-mail address which he couldn't use without a special reference number he didn't get. Next one told him to apply for a second delivery.without any reaction to it. And everyone else told him that He cannot do anything as it will be going back to Canada. 

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https://www.deutschepost.de/sendung/simpleQuery.html?locale=en_GB

 

Put your tracking number on the German Post website and see what happens...