Nike sux

I received a voucher 4th august for a 10% discount on pirchase. I went and they said the voucher isnt valid. Spoke to the manager and he wants to refer me 2people who do vouchers. What they gonna do give me another voucher nike cant honour

They said they can't honour it. I buy there twice a month and a lousy 10% they couldnt honour. I bought stuff on assumption ill get the discount . If they no longer offer these they must still honour the vouchers to those who got them