What should I do if there is an unlawful warrant out for my arrest?

I am on probation for a felony criminal mischief charge and I was doing very well so I thought. Today I received a call from my probation officer telling me there is a warrant for my arrest and I will be arrested on my next appointment. The reasons were I haven't done community service hours, but I have and I have proof. She told me I haven't paid your dues. I haven't paid in full but I have sent payments and I offered to pay in full as soon as today with a loan I was granted. They won’t agree to remove the warrant. She told me I haven't done my classes. I went to register today because I was advice on my last PO meeting I needed to register for my classes this month. I have a paper to prove I am registered and that I did not attend a meeting. My probation officer never scheduled such meeting, and she agrees with that. I have everything they need from me and they don't want to remove the warrant. They said I need to be arrested and go thru the process of being booked in and pay for bond, but when I called to verify, they said I do not have bond. This is just so crazy. I can’t understand why do I need to be arrested for? With my life and my family (daughter and wife), I can’t afford to go to jail and lose my job. Is there anything I can do to delete that warrant and prevent that arrest? Can you please advise me?