Cannot get through customer care

Hi, I bought a fridge from Hi-Fi Corporation 2 weeks ago, the reason I chose this specific fridge was for the holiday worth R4000 that you receive `not' win. To date I have been trying to redeem this reward and all I get is a sms stating that this is an incorrect product number. I have double checked the number on the website and it is the correct number however I can't understand what the problem is and there is no one to get assistance from. <br> <br> I need some assistance before the 31st of December as this is when it expires or I will take legal action.<br>