Pathetic service and *********** staff seriously lacking customer service ethic

It has been 3 weeks now since my parcel has gone missing and nobody is getting back to me after assuring they would numerous times after having escalated at PostNet Call Centre on ***8 on 3 occasions as well as at the Branch themselves. The call center number just rings and when you do get through after the 10th try , you are greeted by *********** individuals making false promises on phoning me back, with a seemingly don't care attitude on the severity of the missing parcel. On the last occasion , I asked to speak to someone in management as it was clear that my query was beyond the scope of this persons ability to solve and I was told there was no-one else to speak to, then was transferred to number which went to voicemail, stating that they would be back at work on the 17/05. The date I called was the 23/05 After enquiring about their courier partner contact details the lady said they even they don't have a contact person for Aramex.... How does this business function... I cannot find an email for PostNet Head office only the above number Hello Peter please assist