Calcutta Electric Supply Corporation [CESC] — Unnecessary bill amounts

Respected sir;
My consumer no.[protected] and Customer ID [protected]. CESC officials had given a bill showing 9154 and on august it showed 1066 units. So total unit consumption 912 units.I payed the following bill amounts from Dec 2019 on wards...Rs 350/-, Jan 2020(Rs 390/-), Feb(Rs 280/-), March(Rs 630/-), Apr(500/-) and June(Rs 130/-).But unfortunately i found cesc gave me my May billing showing 1439 unit consumption and Rs 12185/- and July showing 22 unit consumption and Rs 3837/-. So this is the improper billing amount imposed on me by CESC. I shall be thankful if you kindly give me fresh bills showing proper amounts so that it becomes payable for me as per my unit consumption.
Will be waiting for proper billing amounts for the two months(i.e. May and July so that i can coordinate.