Existing Customer Cannot review plan options

Please help me understand that as an existing customer, I cannot review my options with Xfinity.  I don't know any other business that is run this way.   Everytime I try to look at options, I am asked to call a representative.  I used the Chat service and called but I remain unhappy.    By constant searching, I found a few bundle prices and stand alone service prices, however,  when I called, I am told those are for new customers only.  This is so frustrating.  I would like to think through retaining my triple play, dropping to another plan, perhaps changing to a double play, or going to internet only.   I can't research the options available to me and the prices (including all associated fees and taxes please)!     Second, please make me understand why a new customer would pay so much less than I would.  What if I am willing to remain a customer and lock in a plan for 2 years like a new customer can?  You don't seem to care because you don't offer me that option.