North Bihar Power Distribution Company [NBPDCL] — wrong billing generated issue

Address:

Patna, Bihar

On march-2020 bill, last meter reading was 21609 which was paid in amount 878 rs. For 159 units on 11th march. Then i got april bill in amount 922 rs. Through mobile message which was paid on 15th april.
Now again i received may bill from meter reading 21609 mentioned on march bill to 22062 that is 453 units, although last payment 922 rs. Is mentioned on current bill but not amount deducted from bill.
I want to know, what about 922 rs.. Kindly fix it and generate new fresh amended bill before due date.

Ca number[protected]