Wilful or deliberate failure by any licensee or agent or officer thereof, to pay any moneys, when due for any materials or services rendered in connection with his operations as a contractor, when he has the capacity to pay or when he has received sufficient funds therefor as payment for the particular construction work, project, or operation for which the services or materials were rendered or purchased constitutes a cause for disciplinary action, as does the false denial of any such amount due or the validity of the claim thereof with intent to secure for himself, his employer, or other person, any discount upon such indebtedness or with intent to hinder, delay, or defraud the person to whom such indebtedness is due.