Hi zhazira64,
Welcome to the Apple community where some of us do our best to help each other.
Wondering if you were given a CaseID in the transaction details, when they told you the money would be returned.
If so, there may have been a link to view case details.
Here's another way to:
"Get help with content you've purchased through Apple."
https://reportaproblem.apple.com/?s=6
Else
You might want to check this Apple Support info.
How long refunds from the App Store or other Apple services take:
https://support.apple.com/en-au/HT210904
Or
If you used Apple ID when you cancelled:
You might want to sign in to My Support with the same Apple ID that you used to start your case,
then look under the Recent Activity section.
You may see some progress, or find out if a refund is being issued, or if a response from you is needed first?
Other ways to get in touch with Apple:
Media services
Choose your country or region
https://support.apple.com/choose-country-region/media-services
Apple support and service
See a list of Apple phone numbers around the world
https://support.apple.com/en-au/HT201232
Apple have a webpage for billing and subscriptions that may help you:
https://support.apple.com/billing
Hope something here will help you :)