(k) In case where there
  has been any unreasonable or vexatious delay of payment or intentional
  underpayment of compensation, or proceedings have been instituted or
  carried on by the one liable to pay the compensation, which do not present a
  real controversy, but are merely frivolous or for delay, then the
  Commission may award compensation additional to that otherwise payable under
  this Act equal to 50% of the amount payable at the time of such award.
  Failure to pay compensation in accordance with the provisions of Section 8,
  paragraph (b) of this Act, shall be considered unreasonable delay.
  (l) In case the employer
  or his insurance carrier shall without good and just cause fail, neglect,
  refuse or unreasonably delay the payment of weekly compensation benefits
  due to an injured employee during the period of temporary total disability the
  arbitrator or the Commission shall allow to the employee additional
  compensation in the sum of $10 per day for each day that a weekly compensation
  payment has been so withheld or refused, provided that
  such additional compensation shall not exceed the sum of $2,500. A delay in
  payment of 14 days or more shall create a rebuttal presumption of
  unreasonable delay.
  (m) If the commission
  finds that an accidental injury was directly and proximately caused by the
  employer's wilful violation of a health and safety standard under the
  Health and Safety Act in force at the time of the accident, the arbitrator or
  the Commission shall allow to the injured employee or his dependents, as
  the case may be, additional compensation equal to 25% of the amount which
  otherwise would be payable under the provisions of this Act
  exclusive of this paragraph. The additional compensation herein provided shall
  be allowed by an appropriate increase in the applicable weekly
  compensation rate.