The response was sent to the email address on your account, set at Users -> Personal Settings in your Dashboard.
Here's the text from Beau:
I've refunded your account and removed all upgrades except for the domain you purchased. Unfortunately you are past the period during which domains can be refunded (48 hours). I left your domain registration, mapping and private registration active.
You own your domain for the next year, and it remains linked to your WordPress.com blog, so you can keep using that if you like.