Missing Parcels or ******?

I have contacted the Post Offices several times regarding missing parcels from overseas. Up till now, I am still looking for 2 parcels from Banggood as well as several from Geek. 1. How is it that with all my contact details on as well as contact number PLUS the supppliers details, the packaged cannot end up with the buyer? 2. Where does all the unclaimed parcels go to? 3. What strategy has the SA Post Office have in place for this? 4. What is the responsibility of the SA Post Office towards packages that just go MISSING?? ********** ********** ********** Local Post Offices, etc. Regards!!