I think it is 10,000 or more is free so the cable isn't enough on its own. Of course they should realize/put it together as one order and not charge. Depends if you just ordered the cable separate they might just fill that order on it's own not realizing or possibly a different worker wouldn't know to connect the two.
Maybe reply back saying thanks, fine waiting the extra days, I added the cable on, you can ship together blah blah to better the chances. You'd have two wait for two packages and the if the cable comes a couple/three days early you can't do anything with it anyhow.
Edited by jant71 - 3/26/14 at 2:59pm