[Resolved]  Su-Kam — Battery not working

Dear Sir,
This is to bring into your notice that on 16/05/08 we have purchased two set of invertor & battery from M/s Systems & Softwares of 27A Metcafe Street Kol-13
In the name of SARDA UDYOG 2, CANAL EAST ROAD KOL 67.& SHREE BHARAT DAL MILLS 2, CANAL EAST ROAD KOL 67.
But within few days of installation the invertor or Battery starts giving problem and the batteries get exausted in 15min - 30 min.
After repeated complaint the batteries got replaced on dated 28/08/08.
Bur the problem didnt solved and the problem started again and after repeated complaint the batteries got 2nd replaced on dated 20/10/08
But the problem still arises as soon as the winter season got over, the battery again started its old problem.
Again we made a complain on 07/03/09 vide complaint no 03/277 & 03/278.
On 16/03/09 one of officer named R Haldar visited the office and issued the field service report vide no 42087 & 42086 and assured us for the replacement within 7 days of the issue of the service report, And on that date also you assured us for a quick response and extention of warranty for further six months from the date of replacement.But till now nothing has been done.
And when i tried to call your customer care no positive response was given from your side
From today morning i.e.. 4th April'09 I tried to call your customer care but of no response than at 3.30pm we talked to you and you assured us that the battery will be replaced by wednesday and the extention warranty will be provided by your Company
Please do the needfull



This is the abstract of the last letter i have wrote to Service centre Su-Kam
But even now its over 7 days has passed but no one from the service center is willing to talk in this matter and they are always saying that very soon the replacement will be done
So what should i do