This quest is not available in game.
Defeat Blingtron 3000 by purchasing his challenge card and challenging him in the Brawler's Guild.
The Blingtron line didn't really pick up until the 4000 series hit the vendor shelves. Few remember the Blingtron 3000, but it was a real engineering marvel in its own right!
The challenge card you've unlocked gives you the ability to fight Blingtron 3000 right here, in the Brawler's Guild.