Where is my package?

Can you explain to me how it is possible to just misplace a package. Nobody can tell me where my package is that was sent on Saturday 29/12/2018. Postnet says it was picked up by Aramex and Aramex says they do not have it even though I can see it registered on the Aramex app. Can you please find my package and get it delivered. Tracking nr : PPA ********** 0115