I would like to request an Apple app subscription refund

Look here, you can

• View your purchase history

• Cancel a subscription

• Request a refund

• Verify unfamiliar charges

• Add or remove a payment method

Subscriptions and Billing - Official Apple Support

Click on the link Kurtosis12 posted, identify the charges, and request refunds, which you may or may not get, as all purchases are final. Apple is generally reasonable, if you are reasonable, however.

If you disputed the charges with your bank Apple will have disabled your account. Merchants don’t like it when you dispute a charge with the bank, rather than the merchant, because the merchant has to pay a penalty to the bank.

Just not using an app is not a valid reason to get a refund. And if you have active subscriptions it is your responsibility to cancel them, or you will continue to be charged for them.

Click on the link I provided. On the page it opens up, click on "Request a refund".