Like Sabii says, we need more information.
It sounds like this loan may have been defaulted - have you been paying your loans, do you have any lates (especially >120 or 150d)?
Assigned to the government means that when you defaulted on that loan, the debt was sent back to the government by the loan agency, aand then it was assigned it to one of the govt's guarantors/collection agencies to attempt to get the money back.
You would have completed your rehabilitation with that CA, and then either it was sent back to the original servicer or you were assigned to another. When you consolidated, you should have picked which servicer you wanted (I'm not sure if you rehabbed/consolidated at the same time - I did mine separate and I remember choosing for consolidation but not after my rehab - though it's been a while).