Very disappointed long time customer

I returned an item which I have never opened. It is in its original packaging but Takealot is refusing the return because it is returned after 7days. I am pregnant and bought a baby cot, decided to move in a new place and now I realize the bed won't fit. I realized this by looking at the size in the description. THE BOX IS SEALED. I've asked them to credit my Takealot account in order for me to purchase something else from their app but they refuse and they still have the cot in their possession. I got no communication regarding the status of my return I had to find out from the app. They are telling me that is was supposed to be returned within 7days if the size is incorrect. It is not underwear or clothes it is a baby cot which I planned on opening after painting the nursery room. I already bought a new cot and have no use for the one that is still in their possession yet fully paid for.