problems after discharge from bankruptcy

After I was discharged from bankruptcy my husband and I received a loan for a car(no problems other then high interest rate). Just recently they informed us that as of February (1 1/2years) after discharge that 2 of the creditors have submitted us into the burreau, with amounts owing. My question do they have the right to do this? They did not take any action against us prior to the discharge, why now? What can I do about this? It is seriously affecting us. Its a little hard to rebuild our credit, not to mention the place where we were financed for the car said that they would never have given us the loan had this been on our credit history. One of the amounts is rather large.
I have contacted the bankruptcy agency where we filed, but no one will return my phone calls. If you have some advice for me that would be greatly appreciated.
Thank you