Bajaj Electronics — product fault, not working well

Address:

298/b,sharda colony,maligaon ,guwahati, 781011

M using bajaj stablizer for my ac, but its not working well, wen ever voltage goes down my ac turned off, this stablizer is not able to maintain the fluctuation, if this will continue den it will damage my ac, my product is in garentee period, so i decided to replace or repair my product but bajaj is not taking proper action on it, everytime dey call n enqire the same question, n some time der official agents are very unprofessional, they dont know how to talk, full of sarcastic replies, now m really not happy with this service, plz take proper action on it otherwise i will go further.