SPAR Albany competition not VALID

I entered the Albany Competition and received a SMS confirming that I won a R1500 SPAR Gift e-Voucher. I went to my nearest participating SPAR stores when is about 50KM from where I stay and they did not have an idea of the how to claim the SPAR Gift e-Voucher. I then contacted Albany Bakery from the number on the package and they confirmed that I did indeed win and that they will contact me. It's now over a month and they have gone quiet. Was given their WhatsApp Number: *** and given ***.