Tamil Nadu Electricity Board [TNEB] — voltage fluctuation in chrompet nehru nagar

I am Nimrutha residing at Rajaji street, Nehru nagar, Chrompet, Chennai-44.Few weeks back there was heavy voltage fluctuation happening at every night. And the issue was fixed after we raised a complaint in the Eb office. Again yesterday night we faced the same issue.It is very much annoying and we can’t sleep at night. Kindly find a permanent solution to fix this issue.