TFG their vouchers are waste time

I want to complain that the vouchers that I received from TFG are a ****. I purchased two pairs of takkies and I received one for R50.00 to use at Debonair. I went to TWO different branches and both said that the voucher is INVALID! The second one I received is for R100.00 but it is only valid if i pay full price on an item. Otherwise I cannot use it. This is a ****. Waste of time.