Ordered an item online in October and never received it. No refund done either.

I order a pair of jeans and a shirt online. Only the Jean was delivered which did not fit me. I thought the shirt would maybe come in a separate delivery. Seeing as the Jean didn’t fit , I took it to Eastgate mall Forever New in the courier bag that it arrived in to return the item. At the store they took back the jeans and said I would receive my refund. While there I mentioned to them that I didn’t receive the shirt. Inside the bag was the delivery packing slip from DSV. On this document the quantity 1 for the shirt was scratched out with a pen and marked as 0. The cashier that was helping me said that this means they didn’t have stock and I should call customer care. I have tried calling everyday and no answer. I emailed them and all they did was send me a proof of delivery. I am not disputing a delivery was made , I am saying only the Jean was delivered and I paid for the shirt. I have asked if a separate delivery was made and no response. They did not even care to investigate with DSV who packs the order if all items were packed. They have stopped responding to me on mail and their customer care number just rings. I paid for the shirt that I never received and I want my money back.