Can someone help with a subscription cancellation refund issue?

Hello, I recently tried to cancel my subscription that was set to end and thought I had done so. I look at my bank account and realized I was charged a whopping $40. Further I’m a student, have barely any money and I’m saving up for the fall tuition. I really need the money back. I am going to have to buy new textbooks. Will somebody from Shopify please help me and look into a refund for me. It will be unbelievably appreciated!

Thank you,
Aadya Jain