i want refund, i cancel already my subscription

Normally, all sales are considered final, but you can ask for a refund.

If you have received a confirmation email, click the Report a problem link at the bottom.

Purchases problem.      

How long refunds from the App Store or other Apple services take.   

The money should show up on whatever payment method you used.

How long refunds from the App Store or other Apple services take.   

Then use the links to ask for a refund if you want one.