Uttar Pradesh Power Corporation [UPPCL] — money taken without receipt

Address:

Lucknow, Uttar Pradesh, 226015

On 5 July 2018 two people from electricity board came in saying they were here to cut the connection because o[censored]npaid dues of two months.I told them it will take me another one hour to pay the bill then they asked me to give 550 rupees as a late fee for which they did not give any receipt and left.i want to know how they charged this fee and if it was fair why did they not give me receipt.