If it wasn't KL's fault the ball wasn't changed but the ref's, then I would think KL's manager has a genuine reason to complain, unless he was happy thinking a flat ball might spoil Nott's game and said nowt. I haven't heard of any complaints but in any case it's too late now.
Here's a poser for you. Isn't a ball supposed to be ball-shaped? If it isn't then it's not a ball.