IF they can prove that you knew you were going to file and intetionally rang up debts, they will be removed from discharge and you will have to repay. Not knowing who those creditors are though it is difficult to say what their reasoning is. Some debts are difficult to get discharged. for example if you have debts that are a result of criminal acts, you cannot discharge, like lawyers fees for criminal courtcases, bailbond bills, civil judgements for damages from a acriminal act (i.e. property damage from an auto accident where you were criminally at fault ,DUI ex)