Max Account & Billing

I still have my AT&T plan that lets me use hbomax but hbomax is saying my subscription is expired and I can’t watch anything yet i still pay my bill regularly that includes HBOmax ?

I want to take off HBO MAX AND SHOW TIME

I have the internet fiber 1000 plan and it said free HBOMAX for 3 months so trying to cancel before it charges but saw someone mentioned it's free indefinitely as long as I have fiber 1000. Is that true? Or how do I cancel? Cannot find on att links

Is there any way to create a child or sub login under my primary HBO Max account? My HBO Max account is linked to my primary AT&T account.  I do not feel comfortable sharing my billing username and password with my teens.  The last thing I need is them having access to all of the acco

I was told I would be getting HBO free for life, but now being charged $39.99. I keep having to call and get this charge removed, which takes hours. Why?