Lost Parcel

On 20/02/18 I used the branch at Cape Gate in Cape Town to send a parcel to Serbia. Tracking nr CN ********** 13ZA refers. The parcel was collected on 21/02/18 at Cape Gate and taken to the HUB in Epping. On the same day it left the CPT HUB only to be scanned in JHB HUB on 09/03/18. So far the parcel did not reached it's destination in Serbia. My questions are between 21/02/18 and 09/03/18 what happened to the parcel and why is it not at its destination yet. I have used this service before to the same address, and it only took 12 days. It's more then a month now and no one can give me an answer. I have mailed customer services twice allready without any answers from them. Is the service at the Post Office so poor now. Please help me.

Regards

Eric