I'd say take the call. If they sollicited you, listen to their offer. If you sollicited them, do your pitch. Acknowledge and clarify that you understand their position; communicate yours. Courtesy doesn't hurt.
I'd focus your pitch on what you need and want. You may think you don't want something but quite often it's just because you don't know much, and vice versa. That is unless you know exactly what you want and what you don't, but that certitude is too common to mean anything except for those who toute it as one of the important traits of great founders in a continual pattern recognition that glosses over serveral biases (survivor, selection, salience).
What kind of answers are you expecting?