I had the same issue happen to me about a month ago, and also paid the flat $300 fee. I called Apple Support yesterday, and explained to them my situation and their current program. The employee that was helping me put me on hold a few times and eventually had me talk to his 'Senior Supervisor'. I then had to re-explain what was going on, and to my surprise, this was the first time the 'Senior Supervisor' heard of the Video Card warranty/program. He asked for my serial number and called my back to 'look into it'. About 25 minutes later, he explained the refund process to me. It will take about 4 weeks total, and you will have the option to get refunded via check or bank deposit (you'll need to give them routing number etc. if you choose this route).
https://www.reddit.com/r/cscareerquestions/comments/3fvss3/r...