Does Xfinity investigate when someone is fraudulently let on to a customer's account?

My case was considered closed when I reported a SIM swap scam that occurred on Saturday, July 19 because I had my phone number back working on my device.  However, there are lose ends that they keep telling my are resolved. The fraudster's device is still listed on my account with my phone number.  They have told me three times that it has been updated and that it was escalated to Tier 3 support.  It still shows the same thing in my account profile with nothing updated.   

I tried to get in touch with Security Department to ask about having an investigation done on this.  I want to see the records of when this transfer of my phone number to the fraudster.  I cannot get in touch with Security.  I have called the Security phone number and was on hold for a long time before a rep came on the line.  I started to tell her what had happened and she told me I needed to talk with Mobile.  I told her I had already worked with Mobile to secure my phone number but had questions for the Security Department.  After I finished explaining, she was no longer on the line.  I have spent several hours on hold since last Saturday and am at my wits end.  I am starting hate Xfinity with a passion.  I will not let this go and am considering reaching out to the others I have found online who have had the same issue to see about a class action law suit.   

Anyone reading this who feels as I do, please get in touch with me.