How Do I Turn Myself In When My PO Is Not Responding?

Someone I know talked with their probation officer and told him they couldn't pay the fines any more and wanted to turn them-self in. Probation officer said he would violate them and then a warrant would be issued. When that was done, the person was to call the probation officer and he would give directions of what the next step was so they could turn them-self in. As of last Monday, more than 6 phone calls and messages to the probation officer who's phone keeps going to voice mail, messages left asking for directions and NOT one phone call back to guide this person to what they need to do. This person wants to do the right thing but the probation officer isn't doing their part. What is the answer to this problem please?