A Long Outstanding Swap Out

I bought a Defy fridge on 27 November. It was delivered on 02 December. It just never got cold. I logged a fault with them on 07 December and after a follow up on my side, they sent a technician to come and look at it on 21 December. It turns out that the fridge did not have gas and he suspected a leak. He recommended that it be swapped out. I followed up 28 December and I was advised that they are waiting for internal approvals. These were received on 29 December. I was advised that they were waiting for logistics to execute on this. I have been following up with no joy. The call centre gave me a number that I should contact ***) and a name to ask for (Thato). I have been calling everyday and the phone never gets picked up. There seems to be no desire to swap out the fridge. I believe that if I have asked for a refund, I would have bought another fridge by now. Maybe not a Defy fridge.