Delay in delivering my documents.

I recently sent a document via their services and it still has not been sent. I keep telling them to drop it off at the drop box but everyday I get the same excuse, that consignee refused the document due to delay, what delay may I ask. When you call them the phone just rings you have to wait about 8 minutes to be seen to, what about your airtime that is wasted. I have a due date by the 12 November 2021 for my document to be submitted and I am still waiting. This is document is an application for employment. What happens if I miss my date due to their incompetence. On numerous times I have contacted their offices to notify their delivery personnel to drop my document in the drop box outside the building but they still go ahead and do their own thing and say SAPS has rejected my document because it's late, whereas the closing date is the 12 November 2021. I have requested for the delivery personnel to contact me when at the destination to clear confusion, I still await their call.