Use a short & custom URL customers can visit to cancel or request a refund for their subscription: A micro trick I learned from Uber's credit card statement descriptor.
Instead of requesting a chargeback from their banks, customers will visit the URL mentioned on their statement and can directly refund their subscription. When customers request a chargeback, your payment service provider will charge fees, debit the funds from your account, and increase your chargeback percentage (which may let to a block).
See this Tweet by levelsio:
There are SaaS available as well, for example, easyrefund.me