Onida split AC
Gas leakeage two times with in one yea

I was purchased a ONIDA split AC from M/s. Rathna Electricals on MAY from 3rd month i.e. August 08 nil cooling was effected, i compliant with Rathna Electrical T.Nagar, for reddresal, a technician came and examined AC and told us that Gas was leaked, the next day he fill the gas. That was not long life, in April09 the same low cooling was effected, the reason is Gas was again leaked, this time they collected Rs. 2000 for the purpose but today the same compliant (12.7.2009) no cooling. Once filled the gas how many days it lasts? How it possible for a common man can bear the charges recurring gas filling?