Discovery Vitality - Pathetic Service

I used my rewards to buy an exclusive books voucher. When trying to use it, it did not work. Escalated this to them on 16 March and was told I'd have feedback in two days. Called back and was told 7 days. Called back again and they told me they were working on it and they would let me know. It is now 19 April and I still do not have feedback. Absolutely pathetic client servicing!