Account Owner Designation

I have been using CC as a tool for a client/organization for several years.  I have always had complete access to all areas - sending campaigns, managing lists, billing etc.  Last week I received an email that the prepay balance was running low,  When I logged in to make a payment I found I had been assigned a role - Account Manager.  The Account Manager does not have complete access and can not make payments.  The Account Manager also can not change the roles.  How do I find the Account Owner?  I am the only one in the organization who uses Constant Contact so I do not understand how this role was determined?  I need to resolve this now.

Thank you.