Consumer Redressal

I purchased 1 Hp Texmo Water pump (S.No 37118923) from Navkar Iron Store, Sadar Bazar Gurgaon 122001 having Tin No- 06111901046 vide cash bill number 7447 on 23/12/13 at around 5.30 p.m. amounting Rs 9200(incl. vat Rs. 459).When we tried to fit the water pump in the pipe there was some problem in inflow and outflow of the pump as compared to the old pump used by us. I called the shopkeeper at landline no 0124-2320194 at 7.30 p.m. stating him the problem and told him that I will come tomorrow. On 24/12/13 at around 6.30 pm I took the water pump along with the old pump to store and asked the vendor to replace the pump with specifications similar to my old pump. He said that he does not have that specification so I asked for refund. He refunded me Rs .8741 and deducted Rs 459 the vat amount ; saying that Vat is not refundable. I repeatedly asked for balance amount but he denied and became aggressive.