Complaint

I was at northgate mall pick n pay hypermarket. The was a competition running today whereby you win either a gift card or one of gifts that were being promoted, I won a voucher R250 , and I went to use on the liquor side, I then won again a voucher , when I went to claim my voucher Hendry told me that I can't claim again . And told me I won't get it. The no terms and conditions. I would like to receive my as I have won the were no stated T&C