Usually you get the player you sign. Maybe there was a connection or server glitch. I have never had that happen! So it isn't a thing that happens often, at least. Delays do happen but those are generally because of clock synch issues or the player was scheduled to play, then you can wait up to hours to get him. Bu your experience is something else, I think.

If it happens again send a request to Nordeus Support with any screen shots you have, they should be able to see why.