Account hacked/extra account

We recently experienced severe security issues thanks to theft of banking information; we think as part of that the Xfinity account was compromised (in an attempt to set up web payments with the stolen information). On review of our Xfinity stuff, the primary account holder's info was changed to (Primary name)_LAST-NAME and a new account was added with an email address that was the primary's name with an added period (so if original email was johndoe@comcast.net, this false one is john.doe@comcast.net). This new account was set to the primary so the two existing accounts (both spouses) cannot adjust the account; there also might be a billing discrepancy (stolen services?). Is there any way to straighten this out by phone? Both of the account holders are senior citizens, and the primary is very ill so cannot travel.