Xfinity support lied to me

I recently contacted Xfinity chat support because I wanted to see if there was anyway to lower my bill because it has become very expensive. So I first learn that the actual plan that I have isn't offered by Xfinity anymore. So I wanted to renegotiate for a new deal at a lower price. I went through 3 agents before someone started to help me and despite never having internet issues, I started having them while talking to these agents. So I tried again the next day (Feb 20th) and got someone who said they would help me. Despite being a existing customer, he offered me the Gigabit Plan for 65$ a month (the introductory price for new accounts) for 24 months. He said they usually don't offer that, but would help me out to keep my business and give me the intro price. Was told that I would get the confirmation email within the hour and that my account would reflect the new deal within 24 hours. Neither of those happened. I was lied to by the agent. I had waited a few days since I thought maybe it would take the weekend to update. Never did. So I contacted another agent yesterday and while he understood and started to help me fix my issue, the internet went down again. Once is bad luck, but twice within week talking to Xfinity support? Something is fishy considering my internet never goes down. Now I'm being told that deal has "expired" for me despite it only being less then a week and the agent saying it would be apply within 24 hours of when I talked to him. I am absolutely disgusted with the state of Xfinity customer service.