I unsubscribed my hulu account last month but yesterday it charged me . I need the refund

Hello ~ Take a look here at this helpful Apple link…

Subscriptions and Billing - Official Apple Support

You can cancel a subscription, view purchases and ask for a refund all in one handy link. Are you seeing this charge on your device or where?

~Katana-San~

Click ▶︎ Request a Refund.

According to Apple:

If your refund is approved, the funds are applied to the same payment method that you used to buy the item.

Here's how long it takes for a refund to appear on your account or statement:

Store credit—It might take up to 48 hours to see the refund in your Apple ID balance.

Mobile phone billing—It might take up to 60 days for the statement to show the refund. Processing time might be affected by your carrier. You can contact your carrier for an update.

All other payment methods—It might take up to 30 days for the statement to show the refund. If you don't see the refund after 30 days, contact your financial institution.

Click ▶︎ Check Refund Status.