[Resolved]  Hitachi — replacement of ac

we bought a hitachi window ac 1.5 ton rav518htd (mode no) on 14th april 2013.. after a month it stopped cooling.. when we called the customer care service they registered our complaint and told that the technician would arrive in the next working 8 hours, , but it took them 10 days to send a technician for assistance.. when he arrived he told that gas has beeen leaked.. within a month gas has been leaked which is so terrible... they assured us that once they refill the gas the problem would not arise again .. but after usage of 2 months gas has been leaked again... now we need is that our ac should be replaced as soon as possible .. otherwise it will force me to take an legal action ...