Reliance Communications — refund of advance postpaid bill

Address:

Ujjain, Madhya Pradesh, 456010

I'm mahesh an old reliance communication suscriber
Mobile no.:- [protected]
Relationship no. :[protected]

I have been successfully ported my mobile no. From rcom to vodafone on
13/11/2017. And i had paid the approxx amount of bill in advance.
According to best of my knowledge, the bill should be generate on the
Prorata basis.. But i have received the bill for the whole
Month.
Another point is that reliance communication has still not refunded my advance remittence/bill.
I also sent two e-mails on 04/01/2018 ([protected]@relianceada.com
) and 10/02/2018 (Rcomappellateauthority. [protected]@relianceada.com) respectively regarding this but no reply / actions were taken by them.
Please help me...!