you should have qualified for all the four sub rewards by being subbed on their respective dates for unlocking EARLY ACCESS.Everyone gets a free level 60.
I have only been subbed with 60 day time cards..I'm downloading the patch I can only confirm it later..and I'm sure I haven't missed a day ..I always sub again before my time runs out
I think they are really trying to make sure referrals don't count..it wouldn't be good if someone used a referral later on and unlocked the KotFE story chapters lol