Xfinity Agents are making promises that aren’t being honored.

I was contacted over a month ago by an agent who offered me a new plan that would include the gigabit internet plan that offers 1200 mbps and television service. I was told that my monthly bill would be increased by about $10 after the applicable discounts had been applied to my account, which sounded like a good deal. 
I saw that the estimated monthly bill would increase by over $60 dollars. After asking about it and going over it with the agent for a few minutes, I was told that the actual bill would be lower and that my Xfinity Mobile bill was being included in that total. That was not the case.

My Xfinity bill went from $101.26 to $242.13. This includes a $33.10 partial charge. 
Once I noticed this I called and talked to another agent to cancel the plan and revert to my previous one. She told me that I wouldn’t have to pay the full $242.13 that’s being charged to my credit card May 9th. That’s what I was told but the bill hasn’t been reduced. Also, my internet speed was never increased. It remained the same.

I haven’t had many issues with my service over the course of my time with Xfinity, but it bothers me to continue doing business with a company that shows me so little respect.