Sent wrong product and not everything I ordered, no response after contacting them

I bought a Traverse Portable braai with tongs, fish grid and large foil roasting trays. The delivery was quite fast, 2 days (18 Dec). But they sent a different much cheaper braai, the tongs and fish grid, not the foil roasting trays. I contacted them immediately, I was asked to send an email so they can replace it which I did the next morning as the delivery company will do last deliveries on 24 Dec. I haven't received any correspondence, I have been calling but there is no answer, it is now Monday 22 Dec.