They do need the W-9 to give you the 1099. But you can't take legal action for this for two reasons:1) You can fix the situation by sending them a W-9. The law will not entertain a lawsuit when it could have been averted by a simple, inexpensive, easy act; the law expects you to minimize costs and losses, not maximize them (by going to an unnecessary lawsuit).2) You have not suffered any loss or damage from the delay, and the law does not provide compensation when there is nothing for which to be compensated.So send them the form and get your 1099.