Membership Perk

I received an email from Xfinity stating that because I'm a diamond member, I just have to claim Peacock Premium to get it at no cost.  The email included a link, which I tapped.  There was no Peacock Premium offer, nor mention of, on my membership or benefit page.  I did a general search to see if it's a legit offer & found that it is.  I called customer service.  I spoke to one person who eventually transferred me to another.  After 90 min of back & forth and much patience, I was told that I was only able to get Peacock Premium at no cost if I upgraded my internet.  I expressed how as a member benefit, that made no sense to me.  I also let the person know that this was not mentioned in the email I received; she said to go to your subscriptions & it would be noted there - so I did & it was not.  As I tried to explain that there is no mention of this anywhere that I can see, even on their own membership website where they list benefits of each tier, I was ignored & talked over.  Frustration was about to get the better of me so I let her know she was not being helpful, said goodbye & hung up.  Who can help me with this?