RTO India — not receiving the receipt

I have paid the fine for wrong side driving (Rs.1000) at the traffic signal near mit wpu puad road, in cash. But i have not received any receipt and the officer did not provide me with it. He said if i refuse to pay (If i don't get the receipt) he would confesticate my vehicle.
Plz resolve this issue so that we receive our receipt.
This is my first offense of any rule, and that was due to closing of roads by the clg (Mit) and i had to take an unfamiliar route this ending up on the wrong side.