Poor service for redeeming vouchers

McDonalds rewards redemption is very poor. I have a total of nine tickets which I specifically purchased meals for so that I can get the Numetro deal. Only to be told that its no longer available when I wanted to redeem but yet it is still being advertised. Then I tried redeeming for other stuff and keep getting trouble shooting message. I emailed the contact centre to ask if the could assist with redeeming the vouchers, I havent received any response....