First set - I can't believe you're still moaning about that, lol. 2x works fine on the front of 20" bikes and has done on hundreds of bikes for the past 10 years or more. It's easier to lace than 3x anyway.
Second set - that is a genuine mistake, my apologies. Last week was pretty nuts, mega rush with East holidays and good weather! Please send them back and we will return black to you and pay your postage costs for getting the silver ones back to us. Returns form is here: http://www.tartybikes.co.uk/pages/terms_and_conditions.html#returns
We really don't seem to see eye to eye about spokes, haha, so it would probably be better for both of us if you ordered elsewhere in future actually
Edit: I've got my "it's a sunny Sunday afternoon and I've had a good weekend so I don't give a crap until the bedlam starts again at 9am tomorrow morning" head on, so that probably comes across all wrong - sorry.