Kerala Water Authority — Fake water connection taken by somebody in my name

I am an NRI working in Abu Dhabi, UAE and residing in Paravoor, Punnappra, Alleppey India. I am having a Water Connection vide Meter No.[protected] Consumer No.[protected]. I have been paying my water bills regularly and no dues against my connection.
15 days back I received a notice No.KWA/REV/HC-1600/16 dated[protected] from the Water Authority informing that my water bills are pending. When my daughter contacted the Office it is found that somebody has taken a fake water connection in my name in 2001 and using the water without paying any bills from 2001 (Consumer ID [protected]). A written complaint has been lodged to the office same day, then they have taken the complaint but refused to give any acknowledgement saying that this meter number is not yours so no problems to you. But 3 days back I received a Bill No.22770905 dated[protected] from the Authority Office showing an amount of Rs.13, 201/- is pending. Again we have approached the Authority Office and lodged a complaint and asked them to disconnect the connection immediately. Copy of complaint and acknowledgement slip is attached for your ready reference)
On enquiry about how they are continuing water supply since 2001 without getting any bills we ate not getting a proper response. We told them to stop the water supply immediately, then, they informed that if you pay the bills then only then they can disconnect the connection.
I cannot understand how a person can take a fake water connection in my name without having proper documents and without doing physical verification by the Authority peoples. So I suspect that somebody in the authority office is involved in the process of getting the fake connection and also getting continuous water supply since 2001 without paying any bills. I, therefore, request your goodself to please look into the matter and do the necessary to bring the culprit before the law and take legal action.