It is easier to just say that You made a factory reset in your phone and now it ask's you for activation code or that You receved a prosent , a WP7 phone .... be creative ;P
Use chat support , it's easier to lie.
And Activation code work's very like for account.... so when You get your activation code just save it for later, and when you reflesh your dev it should work.
P.S. I also had a problem with sim contacts. In WP7 7004 i could import them but in mando it does not work. So i just used friends phone with android to export my contacts to Google and that's it
All that was left to do is import them in WP7.
And one more thing . Is GPS working ? I'm thinking about downloading Nokia Drive, but will it work?