How do I get a refund for an unintended video subscription?

Hi summer_02

welcome to this Apple (user-to-user) Community!

Re: "unintended video subscription":

"I accidentally bought an apple music subscriptions a few months ago and they refunded me the money

but i dont understand why they wont refund me this time. please help me"

If you haven't already: You likely need to cancel a subscription before requesting a refund

What to do: If you want to cancel a subscription from Apple - Apple Support

or

Cancelling subscriptions is slightly different in Germany, Israel, South Africa, and Turkey

About canceling subscriptions in Germany, Israel, South Africa, or Türkiye - Apple Support

An Apple Music subscription is Apple's own product, so a refund is fairly straight-forward.

We don't know much about the video subscription : Seems Apple may have merely passed your money on for you to the manufacturer or developer ... (much as a financial institution does with purchases.)

If so, Apple likely doesn't have your money to refund it.

For in-app purchases etc:

If the subscription payment was made to an app developer:

See: How to contact an app developer - Apple Support

       or

The best source of help for a product not made by Apple (a third-party product) is the company or person who made it—its vendor or developer:

How to: Contact a third-party vendor - Apple Support

All the best :-)