Voucher won but never received

I entered a competition listed on a bottle of First Watch Whiskey. Two weeks ago I was phoned up and told I'd won a R1,000 Spar voucher which could be used at Tops, Spar, Kwikspar etc. The lady took down all my details and said I would receive this voucher within 3 to 5 days. Nothing has been forthcoming and no where can you find contact details for First Watch to ask what is happening and when will this voucher ever be arriving.<br>