This has been confirmed working by myself and another ozbargainer (by pm) who also confirmed getting the $25 Gift card and a full refund of Amazon Prime ($99 USD) from this deal.
Amazon Prime is fully refundable as long as you do NOT use any features of Amazon Prime.
For the purpose of this promotion, i would recommend you create a new Amazon account & sign up to a paid Prime memebership via Topcashback link. Then sign out and wait for your $25 Gift Card. Then chat with amazon and cancel Prime and get your refund
Enjoy
Sorry, but is it completely legal to create a new Amazon account for this purpose?