Calcutta Electric Supply Corporation [CESC] — high bill for consumer no [protected]

Due to lockdown no person has come for metre reading but from cesc they sent high bill amounting to rs 7200 which is totally incorrect. My previous bill was rs 204 for the month of february and for january bill was rs 86 then how could our present bill which is for march is 7200. I am senior citizen staying alone not possible for me to pay such an incorrect high bill. Kindly look into the matter and solve it as soon as possible. I am enclosing today i. E 22.4.2020 metre reading for ready reference.