Hello Tanyapa,
Thank you for contacting iTunes Store Support. My name is Ness, your Advisor for today, and I’m here to help.
As you’ve mentioned on your email, you would like a refund for the app you purchased but won’t download. I can certainly understand how important it is for you to get your money's worth for every purchase you make. Rest assured that I took the necessary action to help you out.
I am glad to inform you that I’ve been able to issue you a refund for the purchase. Within ten business days, 4.99 USD should be posted to the payment method used to make the purchase.
For information on troubleshooting apps, please see this article:
If an app you installed unexpectedly quits, stops responding, or won’t open
https://support.apple.com/en-us/HT201398
If you continue to have issues with content in this app, contact the app’s developer directly to clarify the issue. Here’s the link to their website:
http://vandoratech.com/uspell/
Please note that although we mentioned third-party products in this email, Apple doesn’t recommend or endorse these products.
I trust that I was able to address your concern today. Should you have any other inquiry regarding iTunes Store, please do not hesitate to email us back. We'd love to hear from you.
Thank you for choosing iTunes Store. Have a great day!
Sincerely,