Tamil Nadu Electricity Board [TNEB] — fault meter replaced by eb person without anyone's knowledge

My customer no is [protected]
My eb meter serial number is 11327980.
This meter is missing from my flat board since 1 month.
But replaced by a faulty meter with another serial number 11393065.
I came to know only when there was a fault in eb reading this month of july 2017. I approached madipakkam eb and they said it was their fault only and would replace my original meter. Till now they have not changed. I donot know what will be my next month reading.