Kerala Water Authority — discrepancy in water bill

I have a home water connection under changanacherry sub division. The meter for the water connection was physically installed at our house on march 11, 2017. I have received my first bill for an amount of rs 2585. The total water consumption till december 4, 2017 is 22 kl.. On contacting the kwa authority i was told that as per their records, i have been given a pipe connection on april 27, 2013, and the bill has been generated since then. Please help. Thank you.