Mahavitaran — Billing Issue

I am consumer residing at Wanowari Hadapsar 411028, which is having electricity connection bearing consumer no.[protected] . Today, I was shocked to receive the current electricity bill no. [protected] for an amount of Rs 6050. The bill for this month is almost three times the amount of my regular bills.
I investigated the matter from my side to find out the error and I noticed that new meter was installed on 22nd April the person taking reading has not taken May reading and given average bill again. Current bill consumption is given 506 units and last month reading is given as 1 unit.
So please provide me the proof of May reading as 1 unit, as per my knowledge it should be around 180 units. These 180 units should be deducted from 506 units. The current bill should be charged on 326 units.