Unidentified "linked" account, then primary ID removed from my account.

a month ago, was looking at my account online, and saw that there was a new "linked" account...some guy in another state that I don't know. Called comcast, they said this unknown account was a prepaid account, and transferred me to a prepaid rep. she spent an hour trying to fix, and in the end, she removed MY primary ID/email from MY account...when i login now, i only see the unknown account, name, address, but i can see my emails, with some of my phone number info mixed with the other guy's info.

have made half a dozen calls specifically speaking with the customer security area ( 888.565.4329 ), gotten 2-3 incident numbers, and most recently was told by what i assume was a tier 3 rep, that he would assign to a team member, and that i would hear back in 3 days. this was monday, and now it's friday. so as it is, i can't view my own account information, and am concerned what the linked account guy can see of MY info. remarkably frustrating.