Wiz Quiz

My 10 year old child participated in the 702 Wizz quiz. He was so excited at being selected and managed to answer 7 questions correct. He was told that he would receive his prize money in 40 days. This was in June. We have emailed, WhatsApp, tried calling to no avail. This is a 10 year old with a crushed heart and a non-responsive organization who I have no idea on how to contact. I'm not sure if this forum can assist in any way.