Punjab State Power Corporation [PSPCL] — excess billing in respect of a/c no.[protected]

Address: 147001

My account number is [protected] and i have received two consecutive bills for the periods 13/12/2017 to 19/02/2018 and 19/02/2018 to 12/04/2018 under each bill rs.736/- has been charged extra on account of adjustment, but i could not understand on what account this amount is being adjusted. Please clarify the matter at the earliest so that i can pay my bill.