Rejecting a mate wasn't a child's play at all cause it causes excruciating pain for both parties and is a huge taboo. Rejecting a mate is akin to giving the moon goddess the middle finger cause she's the one who gifts the other half of one's soul in their mate.
Dissapointed at the turn out, the moon goddess decided to teach all Alpha werewolves a lesson.She placed a curse on Alphas, they were to remain in their wolf form for four days in every three months until they found their true mates.
This was a measure taken by the moon goddess to ensure no Alpha messes with their matebond again and so far, it's being effective.
Cases of Alphas rejecting their mates was so rare now that the "rejection zone " now seem like a forklore told to the younger generation.