Refunds on iphone 11 / app store

Hello,

i have a problem. I was looking for an app for my iphone , I installed my phone , after that i was on the point where i saw the plan for payments, i realise that it s an app with payment , i wanted to see more detail then i press for buying it by mistake . I took it but after i go and unsubscribe from the app store .. but i saw they took the block the money from my acc immediately..i try everything to get back my money because i didn t use the app and i don t want to do it. Today they took out money for 6 months of using this app. I deleted the app after I unsubscribe, now i want my money back , a refund. Can someone help me please? Thank you