Bill went up by 44%?

Hello. 

My I went to pay my internet bill, and noticed it went from 100 to 144.

I think my contract may have ended. I would like to lower my speed to 1 gig, and the xfinity assistant told me there was a 5 year guarantee price of 70 dollars a month. I am interested in this. 

Sorry for posting this here, but it's the only way I can chat, I don't have the time to wait for a live chat, I need something I can come back to. 

Let me know what I need to post what to identify my account with. The number is hidden in my account so I'm not sure I want to post it publicly without the okay. 

Thank you.