email in my inbox in the Comcast server, before Feb 26, 2020, has disappeared

It's just gone. Twenty years of emails in my inbox on the Comcast server have disappeared. Note, since Feb 26, I continue to receive email, as I have explained multiple times to the tech support people, but everything before that has disappeared.  I have talked to Comcast tech support six times in the last month, been assigned support tickets CR902093266, CR903725887, and IH93616514. Comcast has called me back several times on my landline, when I explicitly tell them to call me on my cell, as it is with me all the time. The one time that they called on my cell, I was away from the phone for only ten minutes the entire day. I call back and get put back into the same tech support loop as before, essentially starting from zero again. When I get a hold of a human being, I explain the situation one more time, get asked all of the same questions, then I get transferred, then I'll transfer you to someone else, then someone else, then I get, we'll have someone call you within two days. It's been a month and I'm still at zero. What do I need to do to get someone to even take a serious look at this issue. I see on-line forums where people had the same issue about email disappearing before Feb 26, I'm not the only one with the problem. FIOS is starting to look better and better.