I really don’t know how my money is getting deducted by the name of itunes this is my first iphone mad I don’t know how to use it so please refund whatever i paid to you and stop future payments please do this

I really don’t know how my money is getting deducted by the name of itunes this is my first iphone mad I don’t know how to use it so please refund whatever i paid to you and stop future payments please do this I will very thankfull to you please refund my money and don’t charge in future please i am a new user I really don’t know how to use it please help me I cannot afford to pay please help me