Qatar Airways — Not received my redemption amount of $50 to my PayPal account

I had cancelled the ticket Booking reference No. (PNR):J4O4PT from Riyadh to Bangalore and Back on[protected]. The refund amount is SAR 3821.00. The payment for the ticket was made through my Bank Debit Card. The refund amount has not been credited to my bank account so far. Kindly expedite the issue and confirm.