How to change name on Alarm Certificate and monitoring company

I got married and changed my name with XFinity a couple years ago. I just downloaded my Alarm Certificate and discovered it has the wrong name. I also found my old information is on my touchscreen display when I go to the touchscreen display and to advanced settings -> account information which also listed the wrong email address.  You can't update it there but it says that if there is any incorrect information you need to contact technical support.  I tried contacting technical support 3 times and they couldn't tell where the information was coming from as it was correct on what they were looking at.  I even asked if it is possible that it was the monitoring company that had the wrong info but I was assured they provide any updates to them.  In frustration, I contacted the monitoring company and sure enough they had my old name though they don't keep record of email addresses.  They said any name changes need to come from Xfinity.  I contacted Xfinity again but they just repeated that the information they have is correct.  Can someone please help me get this information updated on 1) my alarm certificate, 2) account information on touchscreen display and 3) the monitoring company.