This happened at Oyster leak in 83/84 with NSS.They had everyone sign a three month commitment ,and 40hours+ per diem if we left prior .This never held up as it was written one-way.They could lay you off if they saw fit.Talk to the Labor board first ,its free.No one can deduct anything from your pay with out you authorizing it.If they feel they are due money from you they have to get a court judgement .Don't delay.