Reliance Communications — charge advance rental for plan activation and not reverse the same after ported no

Dear team,

I have ported my no [protected] in airtel, due to bad revise from your side every time, last time i was change my plan with 499 rental and received bill 1355 which is including last bill and advance rental of rs 499 + service charges. I was paid that bill because of call center executive informed me its deposit and same is refundable when i am change the service, but same is not deducted from my last bill.

Kindly deduct that amount and send me revised bill, else i am not paid this bill.