Loyalty discount

My 12 month loyalty discount is set to expire at the end of this month. I'm planning on switching to a new carrier when it expires unless there is a new loyalty discount.

I chatted with the rep and was told that there will be a new loyalty discount but he doesn't know until current one expires.

Has anyone had any experience where they got a new loyal discount as soon as old loyalty discount expired?

Specifically, I'm referring to $20 per month per line discount on family plan