How do I change my probation officer?

Im on IPS anf add ur knw ur have to have a job anf income to pay your fine. I owed them $640 until they bumped up my payment. So instead of payinq 132 a month I have to pay 182. So I pay them, work, and qo to school. My p.o is ntt tryinq to compromise with me when I should come report. Hey purposely schedules on days I have to work. Hes tryinq to sabotaqe my job.