Philips Double Up promo

Hi There

I puchased an Airfryer on the Double up promo at Game, The Mall of Africa. You had to register your product along with scanning through the receipt of purchase. In return, a voucher to redeem would be sent to you. Its been three weeks and nothing has arrived. I make contact with Philips SA customer care and you are asked to contact Nomfundu at ********** . This number goes to a voice mail.