Calcutta Electric Supply Corporation [CESC] — Money Debited from account but the bill for last month is still due

This is to bring into your kind notice that electricity bill for Sarmila Chatterjee, Customer ID- [protected] Consumer type: Domestic for January, 2021, Bill no. [protected]/01211 dated: 26/02/21 Amt: Rs.510 was paid via UPI(YONO SBI)amounting Rs.500 on 28/02/21 from UPI ID [protected]@sbi at 8:58am Ref.No.[protected], still during the billing period for the month of February I received a green bill with notice of electricity supply being terminated if not paid the amount of Rs.1020 which was the sum of the amount of February and January within the aforesaid time.
This raises concerns to me and I want a thorough inspection of this event. For validation I'm sending screenshots of the UPI fund transfer.
Thanking you in advance,
Sarmila Chatterjee
2nd floor, FL 201
46A/20, Sibpur Road
Howrah- 711102
[protected]