Misleading Vodacom Unlock Summer

I used my Vodacom App to play the Unlock Summer and got a Nandos meal voucher. I first went to Nandos Braamfontein where they told me that they do not recognise the voucher. I then call Vodacom customer care where they said that the voucher is active and it maybe that the Nandos staff were not trained and advised that I should go to different Nandos. I went to Nandos Carlton Center and immediately they said they do not use those vouchers there, I did not waste time and went to Nandos Ghandhi Square where they said they cannot assist me with that voucher.

What ****ed me off is why advertise such things and I have to look like a fool when using the vouchers. Why couldn't they specify if there are selected stores to claim the vouchers? Why is Vodacom misleading clients? I should report this to Consumer Complaint.