Tamil Nadu Electricity Board [TNEB] — excess amount charged

I have been charged to pay a sum of rs.20215/- over and above the bimonthly current consumption charges as noted in the bimonthly card) comsumer no. Being [protected]. Bimonthly cc charges are paid regularly before the due date. When enuired about the the excess billing, it is learnt that it is due to "misuse of tariff".in this connection, i have only single phase line and it is purely residential purposes only. Regarding the reason attributed for the excess billing, i have neither received any communication from the department regarding the "misuse" nor i wonder am i able to do so with a single phase residential line. This can be verified by you by deputing your technical staff to assess the position. At any point of time. Obviously a mistake might have crept in while computing the billing and i strongly feel the entry belongs to someolne else's account instead of mine. I therefore reuest you to kindly look into the matter and advise me for further course of action if any.