How I get my money back??

See this Apple article: Billing and Subscriptions

Subscriptions and Billing - Official Apple Support

See also this Apple article: If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed - Apple Support

In case this is about something you did not want to buy, follow the steps in this article, to request a refund:

Request a refund for apps or content that you bought from Apple - Apple Support