No one will help

I am disheartened and disappointed in Comcast after how I was treated today.  I called the customer service line to change my plan.  I was told that I needed to go online and select my new Internet plan and "not to worry about the dollars" as any discrepancies would be corrected later.  I selected the 500mbps FAST plan for $55 per month.  When I finished with the process, the actual cost ended up being $96 per month.  I pointed this out to the agent on the phone who replied that I needed to go to a retail store and they would fix it because she didn't have access to that rate.  I did so and was sent to speak to the "virtual assistant" in the corner.  The person in that video chat said that she was in the retention department and that the $55 offer was not available to her and that there was nothing she could do.  I went back over to speak to the retail store manager and he blatantly refused to intervene as he did not have that offer to give either.  I went online to Xfinity chat and got nowhere except an offer to choose a higher speed at a higher cost.  

This practice of offering a certain rate and then not honoring that offer is very poor business practice.  The fact that I was misled by the agent is concerning, so much so that I may file a complaint with the FCC.  I have been a Comcast customer since 1996 and to be treated this way is distressing.  Unfortunately, there is no direct way to report my experience other than this.  I will give Comcast one more chance to do the right thing before I order AT&T Fiber for $55 per month.