SA Post Office
No post collection slips being delivered

I am not receiving any slips for me to collect parcels, in Cyrildene, 2198. Parcels have been waiting for me for 3 weeks at Yeoville post office and I am not receiving slips, and when I call every week, they say there is nothing. These are international book parcels, and they cant just send them back, if im not receiving slips, and if they tell me there is nothing there.