E-voucher ****

I bought a e-gift card online for a friend on 21/08. She went to the store to buy items today, 22/08 but the voucher was invalid. After taking the time to speak to a consultant a new voucher was issued and sms'd to her. Once again this voucher was invalid. If the e-voucher system does not work, why advertise it? She had to leave the store with nothing. The money was already deducted from my TFG account but we are unable to use it. Very dissapointed.