SHOCKING CUSTOMER SERVICE AFTER THEY SENT ME THE WRONG ORDER - WONT CORRECT IT

I ordered a baby related item. I hadnt opened it when it arrived as it was not yet needed it and was waiting on the birth of my baby. I opened the box this past weekend and realised takealot had sent me the incorrect item. I checked my ordered and the error was not from my side- my order showed all the required details right down to the colour- THEY PROCESSED AND SENT ME THE INCORRECT ORDER. I tried to return the order and they had said that they wont accept the return as it had past the 30 days. I pointed out that the item was still totally unused, still in its original wrapping and sealed. They had sent me the incorrect item which I had only just realized now that it was incorrect, I wasn't asking for a refund but merely the correct item to be exchanged that is all. It cost me over R500 for the order and this one was totally useless to me as it was incorrect. The issue was from their side and it would have made no difference to them to simply exchange it for the correct item that I had ordered especially since this one was in mint condition and could be sold again. I just had my baby two weeks ago. They had collected the item for exchange but then after the fact said since it had past 30 days they would not exchange it and sent the incorrect order back to me today. Now I'm out of pocket and sitting with an item that is not what I wanted, the fault is not my own and they refused to assist me. I had back and forth emails with them all of yesterday and I was told someone would call me today- now my emails go unanswered, still no phone call. Shocking customer service. Shocking that they wont even so much as take responsibility for the fault being from their side and they processed and sent the wrong item!