Employment Law Questions? Ask an Employment Lawyer.
You are entitled to an explanation from the company for any monies they said that the would pay but failed to pay you. You are entitled to a clear explanation as to any deductions taken out. if this happened without explanation and the money is significant then yes you should contact an attorney because this is a violation of your rights. Keep in mind that the amount an attorney would charge would be significant, maybe 250-450 for a consultation and for a simple mistake that your old company could correct, it might be better to contact them again yourself until you get an answer. This does not seem to be an issue of discrimination so there is no built in remedy. It would depend on whether you had very strong facts to prove statutory and common law violations against you.
Also wanted to note that you should try to keep notes of any conversations you have. Notes many times can be admitted in a court proceeding.