POSTNET N1 CITY "HORRIBLE SERVICE"

If you are wanting anything sent overnight avoid these Guys, went in and requested a package be sent overnight (Small item) the address of the receiver was clearly printed on the box the guy behind the counter at "POSTNET N1 CITY "said no problem and charged me just over R 300.00, I sent this package on a Thursday morning the receiver received the package on Monday, I'm know genius but that's not overnight, and when I complained I was told it was the Courier company they use which is "Aramex" fault and that a investigation had to be done, I understood and when I received a reply it was that it was out of their control and that nothing can be done. My question is how can they blame "Aramex" when I paid them for overnight not Aramex a clear case of a service not be provided and the buck being passed not impressed at all 😡😡😡