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.
If you are the lead booker on a court booking, the full court cost may have been reserved or charged to your card while waiting for other players to join and pay their parts. After the session ends, Nettla calculates the final split 4 hours later and any amounts covered by joining players are returned to the lead booker.
Whether this appears as a cancelled reservation or a real refund depends on the same 6-day rule above. In some cases, you may have seen a charge for the full court cost (e.g. £40) and then receive a refund for the joining players' share (e.g. £30) — this is expected and correct.