Online Voucher

Makro gave me an online voucher to use. I app**** the voucher and didn't finish the checkout process. I then reapp**** it to complete the check process only to be told that the voucher is invalid. When I call their customer care they transfer me to a company that deals with vouchers and that company says to me they don't deal with online vouchers. I sent makro multiple emails and they didn't respond. So disappointed!