Call your lawyer ASAP. The sooner you appear in court the better. Your attorney should walk you into court and explain what happened. Most judges will understand as long as you do this immediately.
As far as the lady at the probation department being mean and rude: I think they get bonuses for being nasty at the probation department. Sad to say but this is very common. I don't know why and I cannot imagine going through life being nasty to people but that is exactly what they are like.
Call your lawyer!