If you cancelled a session within 6 days from initiating the purchase, your refund is technically ”not a refund”, and instead a "cancelled reservation".
This means that no +[amount] will arrive to your bank account, but the original transaction will simply disappear. Similar to how a card-on-file at a hotel vanishes from your bank account if you did not purchase something at the hotel.
If you cancelled a session more than 6 days away from initiating the purchase, you are in a "charged state", and will receive a ”real refund”, e.g. a +[amount] in your bank account. This may take 2-3 days depending on which card and bank you use.