my bankruptcy attorney didn't file a deed in lieu of foreclose in our 2012 bankruptcy and we have been harassed by a lender that bought our loan

Our attorney told us we were not liable for the debt on our loan that was included in our bankruptcy even after I contacted him and told him that another lender bought our bankrupt loan and was refusing to acknowledge that it was included in our bankruptcy. A deed in lieu of foreclosure was never done and our attorney never informed us that one was need. The mortgage company that bought our loan was reporting us 120+ days late on the mortgage for 2 years before we realized what had happened. Most bankruptcy attorneys would know that a deed in lieu of foreclose was needed in our case. What can I do to be compensated for the damage caused to us by this attorney.