Vodacom food vouchers not accepted in most stores.

I am absolutely gutted that I have been keeping my vodacom steers voucher for almost 2 months simply because most Steers establishments in the Eastern Cape do not allow it. For an example in Bhisho and King Williams town they do not accept those vouchers, and even in Mthatha they refuse to accept them now. I feel Vodacom hasn't done enough advertising or enough homework for this promo deal and some of us are really suffering. My R150 voucher is now useless and it's been almost 3 months now since I've bought it. I can't even redeem it anywhere because I'm in the Eastern Cape, in Bhisho to be exact. No, I'm really disappointed