I bought a subscription when the game first came out. for 1 month. I took a long time off, and came back due to 2.1, and bought another month. yet Ive only recieved the veteran reward for 1 month... why?

Do I have to purchase a full 3 month RIGHT AWAY, to get the 3 month veteran reward? If not, why did I only get a veteran reward for 1 month after Ive paid for 2 months so far? I don't get it..