HBO Free Credit - Unlimited Plus Mobile Plan - AT&T U-verse

I've had the AT&T Unlimited Plus Mobile plan since April 2017.  I received the free HBO Credit on my AT&T U-Verse TV bill ever since.  In the middle of April of this year, HBO was turned off, unprompted.  I had to call AT&T and they told me there was some glitch in their system and they added it back.  They said it would take 2-3 billing cycles for the creidt to reappear.  It never did.  I called tonight (9/22/18) and they told me HBO expired with that plan June 29th, 2018.  Since it expired they can't reapply the credit.  When I look at my plan on their website, it still shows I should be receiving "Free HBO".  They told me the only way to get it back, would be to upgrade to one of their new premium plans.  Upgrading plans would give me the same benefits I have now, but cost me $20/month.  Wouldn't make sense to upgrade.  Has anyone else experienced this issue? Are you still receiving your HBO credit with the older Unlimited Plus plan?  Any help will be appreciated.  I fell like I got bait and switched. 

-ChrisDiPlo