Unreliable service with doubtfull contingency plans if any

A really important postage tracking RC ********** 30ZA was handed in at Robertson on 6 July 2018. The sender was assured that I as he receiver will have it by latest 12 July 2018. It is since stuck at Cape Mail Hub and the reason been given is the current strike. This is very urgent for me and one can reasonably assume that SAPO must have contingency plans in place to move the postage or can one assume that SAPO cannot be trusted with something important and that delivery service is unreliable ?