Items out of stock no refund

I ordered items in July 2022 and 3 items were out of stock. The full amount of the order has been paid and deducted from my bank statement. I queried it and they said I can get refunded. I sent my banking details and have not received the refund ever since. Almost 3 month later. No refund. Will not use them again as you first pay and then they let you know items are out of stock.