I'm not sure what you're saying, exactly. Stardock is the company that makes the program Impulse, so I'm not sure what switching is happening. What main support line are you referring to? The only official Stardock support is through email ([email protected]).
If you're trying to play multiplayer, and are having trouble creating an account, that is all handled by Ironclad, who can be contacted by emailing [email protected].