law: Delhi Rent Control Act, 1958 
  26. Receipt to be given for rent paid. - 
  (1) Every tenant shall pay rent within the
  
  time fixed by contract or in the absence of such contract, by the fifteenth day
  
  of the month next following the month for which it is payable [and where any
  
  default occurs in the payment of rent, the tenant shall be liable to pay simple
  
  interest at the rate of fifteen per cent. per annum from the date on which such
  
  payment of rent is due to the date on which it is paid].
  (2) Every tenant who makes a payment of rent
  
  to his landlord shall be entitled to obtain forthwith from the landlord or his
  
  authorized agent a written receipt for the amount paid to him., signed by the
  
  landlord or his authorized agent:
  [Provided that it shall be open to the
  
  tenant to remit the rent to his landlords by postal money order.]
  (3) If the landlord or his authorized agent refuses
  
  or neglects to deliver to the tenant a receipt referred to in sub-section (2),
  
  the Controller may, on an application made to him in this behalf by the tenant
  
  within two months from the date of payment and after hearing the landlord or
  
  his authorized agent, by order direct the landlord or his authorized agent to
  
  pay to the tenant, by way of damages, such sum not exceeding double the amount
  
  of rent paid by the tenant and the costs of the application and shall also
  
  grant a certificate to the tenant in respect of the rent paid.