Vodafone India — Excess mobile bill

Address:

Thane, Maharashtra, 400602

My mobile number is [protected]. i have received mobile bill for the period 18/6/16 to 17/7/16 amounting to rs 4099.57 which is incorrect. actual my bill for the said period is rs 387.33 excluding service tax.
As per my plan, my plan rent is rs 129/- and rent for 3g internet of 1 mb is rs 250/-my internet usage for the said period is 874.34 mb which is less than 1gb. however vodafone has charge rs 3177.52 for using data of 874.34 mb which is not correct..
I have sent mail to vodafone to sent corrected bill however no response from them.
Pl do the needful
Regards
(s r patil)