Richardson is not upset that leading players Jason Taumalolo, David Fusitu'a, Manu Ma'u and Sio Siua Taukeiaho opted to represent Tonga rather than New Zealand but more at the way those players went about making their decision.
"It was extremely disappointing especially when we had no inkling it was going to happen," Richardson said.
"We had sent communication to them via email, text and phone calls. To pull out at the late stage is a bit of a slap in the face for New Zealand rugby league and the game because it is just wrong to do it that way," said Richardson.
"It is about the decency involved in letting the coach and the NZRL know earlier than they did that they weren't going to play."
Richardson confirmed no one from the NZRL or Kiwis had heard directly from 2016 Dally M Medal winner Taumalolo about his decision to switch to Tonga.
"We never got the information from Jason.
"We had heard the rumours and NZRL sent out emails and texts," said Richardson.