Vitality cashback - Problematic dates (lost money)

Hi there So over the last 2 months I bought goods from Pick N Pay and Sportsmans Warehouse because discovery was doubling cashback percentages. SO only to discovery that my cashback dates are messed up on the calendar - not by calendar month. The issue is that because of this I bought goods expecting cashback and then finding out that my Healthy Gear and Healthy Food dates are all mixed up. So I bought my R4000 worth of goods during June. Then I bought again in July but found out that my second R4000 spend falls in the same period as the June purchases so no cashback (R2400 Cashback expected), The thing is that I would not normally have bought the goods if it were not for the cashback. I lost out on my shopping this last month since they changed dates and now I lost out on another R2400 for my food shopping. Really hate the way they encourage this cashback thing but nail people on the confusing dates they implemented. Could not find any documentation which shows me my cashback periods (and if there is - not very clear). I wonder how many people have lost money this way. Some people actually only shop at certain stores (at a premium sometimes) for the cashback.

Spoke to call centre lady and she said she has never heard of Discovery actually correcting a wrong situation like this. The client just takes the knock.

Very very upset...

Morne