(a) If any landlord receives rent in violation of any provisions of this subchapter, or of any regulation or order thereunder prescribing a rent ceiling, the tenant paying such rent or the Rent Control Officer on behalf of such tenant may bring an action for double the amount by which the rent paid exceeds the applicable rent ceiling or for $50 whichever is greater, plus attorney's fees and costs as determined by the court.
(b) Whoever wilfully violates any provision of this subchapter or any regulation, order or requirement thereunder, or wilfully commits any acts with intent to evade this subchapter or any regulation or order or requirement thereunder, shall be fined not more than $100. Any person against whom a judgment has been entered under subchapter (a) of this section shall not be subject to prosecution under this subsection.
(c) No person shall be held liable for damages or penalties in any court on any grounds for or in respect of anything done or omitted to be done in good faith pursuant to any provisions of this subchapter or any regulation or order. The Rent Control Officer may intervene in any action wherein a party relies for ground of relief or defense upon this subchapter or any regulation, order, or requirement thereunder.