Why not message them and ask why you have not received notice of this double miles offer when you know of others who have. Sound huffy, like you may go elsewhere with your business. (Do you have a Platinum Visa or one of the other Signature Visa cards? What cards do those who have been targeted have?)

A few weeks back, I asked about whether the offer would be repeated this year or not, pointing out that I had made use of it before and it was important to me. I was told that I would be given double miles, though I have no other notice of the offer, and no cap was mentioned in the response to me.