This company has someone employed who is using my ...

This company has someone employed who is using my Full name, Social Security Number, Date of Birth. I have contacted the Human Resources department and they have not returned phone calls, nor did any investigation into the said person using my idenity. When I called back the receptionist indicated that this was a personal matter and HR would not do anything. I find it odd that a company wouldn't atleast take a report and look into the background of a person they have employed when a report like this comes in. Reports have been filed online with the Border Patrol, IRS and Social Security Department.