My husband was working as an independent contractor for a man and his company. He was let go over a month ago & still hasn't been given his final pay check. When he inquired about this, his employer sent him an invoice for "unauthorized credit card usage". This was for payments that my husband made, on behalf of his employer (the credit card holder) for work he performed. So, while he was employed, the credit card charges went to an account that the employer was aware of & was frequently updated about by my husband. Is this legal?