5-years guarantee price

I had gotten a message from xfinity stating that I was able to get the 5-year guarantee price after already being a member and for me being so loyal to them as a member that they would apply that to me. I sadly lost the email with the number on it and I tried contacting customer service to see what the email would tell me and they had no help for me saying they couldn’t do that. I was disappointed and upset by the from what I know of false claims that they couldn’t extend it for me. I was paying $65/month and now I’m having to pay about $115/month.