Incorrect billing address

Hi,

     I recently purchased a Dell XPS 400. The product shipped to my residence correctly, but the bill was sent to my older address (where I had earlier purchased a Dell Inspiron notebook).

1. How do I get this issue resolved?

2. How do I get my bill at the address where the shipment was made?

 

I am too hesitant to call Dell Support after my harrowing experience with them.