law: Sale of Goods Act, 1930
  37. Delivery of wrong quantity
  (1) Where the seller delivers to the buyer a quantity of goods
  
  less than he contracted to sell, the buyer may reject them, but if the buyer accepts
  
  the goods so delivered he shall pay for them at the contract rate.
  (2) Where the seller delivers to the buyer a quantity of goods
  
  larger than he contracted to sell the buyer may accept the goods included in
  
  the contract and reject the rest, or he may reject the whole. If the buyer
  
  accepts the whole of the goods so delivered, he shall pay for them at the
  
  contract rate.
  (3) Where the seller delivers to the buyer the goods he
  
  contracted to sell mixed with goods of a different description not included in
  
  the contract, the buyer may accept the goods which are in accordance with the
  
  contract and reject the rest, or may reject the whole.
  (4) The provisions of this section are subject to any usage of
  
  trade, special agreement of course of dealing between the parties.