Calcutta Electric Supply Corporation [CESC] — Wrong(Double) billing o[censored]nits

I am having Consumer ID [protected]. In the Bill for the month of May2020, payable in July I had fully paid the bill amount of Rs9720/-for 1026 units and nothing was kept in abeyance. In subsequent bills however on the back of the bill it is being shown that I was charged for 496 Units only and charges for 530 Units were kept in abeyance, which is wrong and every month i am paying an additional amount of Rs 540/-.
Kindly ensure that extra payments already made are adjusted in the next bill and there should be no such addition in the subsequent bills.