Jeff,
The forum isn't the right place to ask for a refund. You would be much more likely if you send an email to support (a-t) digistump (d-o-t) com

However, in the mean time, please consider
this thread to continue to make use of your Oaks, and keep in mind that Erik is working on an alternative to Particle that will work with the Oaks in ESP8266 Arduino mode...