Luminous Car Battery review: Poor performance

I had purchased a Luminous Car battery from M/s.Hina Batteries,Sector 28,Faridabad,Haryana,last year in May.It started giving trouble only after three months- it discharged after two-three days when car was not in use.I contacted the dealer who replaced the battery but perhaps with another old and not new battery.When pointed out, he told it was new and I had to belive.However, this alsogets discharged after 3 days.The dealer had already checked electrical connections of the car and found that nothing was wrong with the connections and probably was the battery playing mischief.I wonder, is it the Luminous Technology which is boasting in national dailies?I had earlier used EXIDE and it never gave trouble.