PostNet Elridge - Appaling Service!!!

Absolute APPALLING service from PostNet Elridge !!! We sent a package on Thursday and requested overnight delivery. We we ASSURED by POSTNET that it will be delivered at the destination the following day (Friday) after 12. They had no problem taking our money for this service. The package only arrived Monday and they refuse to reimburse us the difference between overnight and normal delivery blaming the Friday Marches but yet they did not mention it on the Thursday and the company was working Friday!!!! DAYLIGHT ROBBERS!!!!