Changing plans - XFinity

My husband recently passed away and I am trying to downsize. NOT POSSIBLE!
I now have XFINITY bundled services, and I am receiving over 100 channels! I would like to sign up for Limited Basic. I went to a Comcast office in person, asking to sign up for Limited Basic. Was told that this is not possible. (Seriously??!!!!)
I was told to call the 800 number and ask about promotions in my area. I then learned that these promotions are short lived, and once you take part you then have to seek out another promotion when the first one ends. That means that for whatever number of years I have left, I'm going to continually be on the phone with Comcast!
Is it not possible to sign up for Limited Basic, and be done with it?
Thank you for whatever help you can provide.

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