Something similar happened between my fiance and his father. They share the same name, but their SSN are nowhere close to each other. His father's credit history was showing up under HIS credit history! To file for bankruptcy you have to be at least... I forget the age requirement, its 21 or 22 or.. something, and on his credit they had him as filing for bankruptcy and he was nowhere near the age requirement to even do so! So some credit union was putting the wrong credit information under his name and/or SSN, which is ILLEGAL. His parents threatened to sue the company that had been putting the wrong information under his name, and he has filed a dispute with the credit company that had the wrong information, and slowly, it is all getting straightened out.

But it is so illegal for a company to put wrong credit information under the wrong name, and if push comes to shove, you can totally sue them and win in court!