No feedback given for Typo voucher for nearly three weeks

On the 26th of June, I mailed Discovery Vitality, as I could not use my Typo voucher to the value of R100 that I selected from the Vitality Rewards, after countless of phone calls no one answered, so I decided to mail. Up to date I have not received any information regarding why I could not redeem my voucher and I get any answer as it is still under investigation in their back officer team. This has been now nearly three weeks! I work hard for every discovery mile and now they took off 1000 Discovery miles and no voucher .. Pathetic.