VODAFONE – (AP Circle) Discrepancy in bill – posting of amount

There is a discrepancy in the bill for my number 9160787369 in the posting of RS 500 (which is one time charges for advance yearly rental) The discrepancy is very much clear if the following bills are compared – bill no.0065853467 mentions as one time charges whereas bill no. 0072343121 mentions as monthly charges.

I had been sending various e-mails to Vodafone AP customer care, nodal officer and appellate authority – the only response received is that it is one time charges for advance yearly charges which I know very well and understand the amount and also paid the amount.

Why the bill is not being corrected ? Why the mistake was done in the billing ? this is an accounts issue hence it should be corrected and the corrected bill to be sent.