Replacement of damaged couches

My mom ordered some couches for my online on the 8th of May 2024. It was delivered on the 20th of May 2024. When we opened the wrapping that was around the couches we noticed the couches was damaged. I immediately notifed mr price home customer care. The asked if we wanted a refund or replacement, I then said a replacement will be in order. After a weeks struggle to an answer out of them, they told me the warehouse dont have any stick to di a replacement. I checked the online website and you can still order the very same couches in 2 different colours. So what I dont understand is why they cannot do the replacement of the couches for me. If they do the refund back to the account and I order the couches again I would need to pay for delivery again or will they refund me the delivery fee as well, seeing that the couches is still available for ordering online. Can someone please clarify that for me??