Tamil Nadu Electricity Board [TNEB] — Wrong Billing, check my meter

Address:

17G1, Muniappanagar first main road, Nerkundram

Hi sir,
My service number is[protected], My billing amount Rs980, billing date 16.may.2021
Because of covid My family shifter to m native place. My last biull amount on March is Rs68, less than Rs100, after that I was use one fan and one Tube light for 20 days, After that I moved to m native palce.
but I got the bill used unit is 450, which is wrong.
I usually get the bill less than 1000, even m whole family members user full time.
Please check my meter or an other problem in my account.