Norton on-line security

One day last week, on a landline, I telephoned our bank and spoke with a representative to resolve issues accessing my account.   While on the phone I was also on-line following instructions.  The issues were resolved.   Two days later I tried to log in and was denied access.   I called the bank and spoke with the fraud department.  The same day my log in problems were resolved, someone in the Chicago area (I live in BC) with a different computer ID logged into our bank account. They had my bank card number, new password and the answers to the 3 security questions.    Under the loyalty program, we were given Norton Security sometime last year.  Only two adults in our household and no one else has ever used this computer.   There is no evidence our e-mails or other sites have been hacked.   I alerted Telus but they seem disinterested.  Given they are selling Norton on-line service and providing it to their customers I think they should be.  I attempted to reach Norton but ....    Has anyone else had a similar experience?