Impossible for existing customers to lower bill

I'm 1.5 years into a 2 year contract.  Even though I'm under contract, my bill has gone up significantly.  I was told by numerous call takers throughout the last 1.5 years that I could lower my TV plan any time and save money.  I am paying about $200/ mo at this point for a mid-line internet and cable plan.  That is an absurd amount of money and not competitive with other providers.  

Attempting to go down a peg on the TV package appears doable on your site, and it offers a $31 reduction in the bill.  Upon trying to execute the plan however, I get a pop up saying other service charges will massively increase.  Hence, the end result to the so-called offer to reduce my bill turns out to be a huge increase ($224).

My last resort was calling.  I try to refrain from calling due to the fact that the call-takers are frequently rude, very inconsistent with answers, and have major language barriers.  This time when I called, I was told I'd have to pay the "cancellation" fee for cancelling the contract.  I repeatedly explained that I was not looking to cancel my service with Xfinity.  I was merely looking to lower my bill to a fair amount.  The call-taker continued to threaten me with fees.. She also refused to transfer me to a supervisor.  She placed the call back into the arduous phone tree and I waited on hold for another 15 minutes.  The next person I spoke with seemed confused as to what "I need to lower my bill" meant.

This is not a way to treat customers.  Also, the fact that deals for new customers are so outstanding, yet loyal customers are treated like trash is a truly bizarre business model.  Finally, customers should not be told they are able to reduce a package if this is not actually possible.  It's a flat out lie, and I never would have entered into a contract with Xfinity if I knew how horrendous it would ultimitely be.  From improperly buried cable lines, to multiple failures in service, to awful call-takers (and hours on hold) - the entire experience is terrible.  

Also, I checked my contract, and it states (under #4) that I would "not be subject to an early termination fee" for changing the level of service.  The call-taker that kept threatening this was either incompetent or purposely lacking integrity. 

I know it is possible to lower my bill, or reconfigure the contract. Can ANYONE at Xfinity help me with this?