Debiting my account without permission

I used to use uber eats and all was good. They introduced free delivery if you order above 80 and you would pay 50 for a month. I did that once and ever since uber have been debiting my account without my permission and when I reply on the mail I got saying I bouth free delivery I get email saying it's an incorrect email. So I want all the money they have been debiting cause I did this once.