I believe they mail you the refund after you sign up for a real administration. I've forgotten if it comes in after payment or after you take the test but I recall one of their info emails mentioning which it is.
If you decided to apply next cycle, I’m sure you will get them again next year. Or just email then about it next year. They are so busy and the emails are done based on numbers (meaning impersonal), I wouldn’t email them a thank you.
Hey Stephanie. Yeah I don't think it's a good idea to use that email. Edu emails are generally ideal or something that has your name and maybe an underscore.