Consumer Redressal

We had bought a hitachi window AC,1.1 Ton,Model RAT513HTD Summer 5 star from Malhotra Enterprises,Plaza mall,Gurgaon. on 11.5.2013 for our 9x11=99 square feet room on 2nd floor(top floor).We had checked the room capacity versus tonnage ratio in the Hitachi website before going for 1.1Ton AC and also got approval from hitachi persons. From day 1 only, we\'re facing a cooling problem.The ac doesn\'t trip below 27degree Celsius.Many a times,we were sweating even sitting in the AC room for more than a hour. We never got the chilling effect though the AC is working for the whole night.i.e-6-7 hours.We lodged the complaint to Hitachi customer care in May,complaint no.- 13052901505, Mr. Tanvir(Engineer) looked into the matter on 11th june and suggested to fix the AC in the middle window.we reinstall the AC but then also the cooling condition didn\'t improve so we again put our complaint ,complaint no. - 130618007521. Mr. Tanvir visited on 1st july and took the observation in his meter (after 2 hours) that reads 26.2 degree Celsius and wrote for machine replacement.After that Mr. Anil Nagar (Regional Head) visied our house and told the following points: 1) Since our room is on top floor that is why the temperature of room does not fall below 26-27 degree Celsius. 2) As our room is on top floor,we should have gone for 1.5 ton AC rather than 1.1 Ton. Also before the visit of Mr. Tanvir & Mr. Nagar,the hitachi persons did visted our house 2-3 times, for temperature check but with no conclusion. 1) Now my question is,after 5 visits,the higher officer of the company is telling us that bcoz of top floor we are not achieving the temperature below 26-27degree Celsius .Where the company has written this condition? 2) What is the proof that the unit we have bought is not defective?.Why no person of the company except Mr. Nagar suggested us to go for 1.5T AC.And why it is suggested too late that we should go for 1.5 Ton AC.Also why it is not mentioned in the company website that the room capacity versus tonnage ratio written on it is not true for top floor. We thus requested Hitachi to either install another unit of 1.1 Ton in our room for making it check that wheather our unit is defective or not.And if it is not defective and there is a tonnage problem then our unit unit should be replaced by 1.5Ton with the balance amount paid by us. But Hitachi ppl didn\'t take any action to make us check that the 1.1t AC unit that they have provided to us is not defective.Also they told us to pay 20% of the total cost of 1.1T AC extra apart from the balance amount left for the cost 1.5T AC. Instead of regretting for all that harashment we\'d suffered,they are putting penality on us. I request your help to know how to proceed further to protect my right as a customer.