Rewards for Engen clients

I recently bought fuel at Engen Kroon ( Kroonstad ) and they offered me a rewards card with 40 cents off per litre each time I fill in at Engen Kroon. But this rewards card only works at Engen Kroon and no other Engen filling station. so I declined as I only fill up when I go to family as we do not have an Engen in Parys . My suggestion to card Engen is to have an Engen rewards card that works at all Engen filling stations for those who have to travel and could in this way earn fuel points. This card will not over ride ebucks and Clicks, so it just means these points can be earned with all rewards offered at Engen, many clients do not have ebucks or clicks