I can't I seem to have destroyed them all, what do I do now, create a new account? Can't complete quest. If they resporn they take their time doing it. Maybe when I accept a quest it should make sure there are enough in the area to shoot.

Keep in mind you will find both Orun Collectors and DenTek Collectors in the training sector. The Orun Collectors inhabit the 'ring' formation of asteroids near the station, the DenTek collectors you will find around the farther set of asteroids near the cap ship. Be sure you are destroying the right type of bot; the target info shows in the top-right corner of the screen once you have a target selected.