Wantitall - Extremely Expensive and Bad Service!!!

I ordered a photography course for my son for Christmas (order number ***) which included a DVD and book for close to R700. On Christmas day when he opened the gift only the book was delivered and not the DVD which was very dissapointing to say the least! I sent an email to Wantitall but received no response. I followed up with a phone call and was told that it was in fact a mistake and I should have received the DVD. I was transfered to somebody that works with returns but nobody answered and nobody returned my call. I sent another email to which I received a response from Sally-Anne Mokwebo saying that the DVD was not included in the order and she closed my enquiry! Just like that! I rep**** that I was unhappy with this but received no response. So here I am, no DVD, nobody returning my calls or emails - what am I supposed to do?! How could Wantitall make a living with this kind of service, not to mention their extremely HIGH prices? CAN SOMEBODY PLEASE DO SOMETHING ABOUT THIS?!