Can you explain why you can't access the funds? I can see your account is South African. We have a partnership with the FNB bank to assist South Africans with withdrawals to their South African bank accounts as explained here.
If you have refunded the payment it depends on the funding source and location of the sender's account. If you send the amount back to their PayPal account it will appear on the PayPal balance instantly but could incur charges if it is sent internationally.