Reliance Mobile — unable to reach reliance and get refund of deposit

I ported my reliance gsm connection which i had been using since the dhirubai ambani pioneer offer days, to airtel. I have paid all bills due; and have the latest bill with me which states that there is nothing due from me. On the contrary, the company owes the deposit to me.

I have sent several mails to reliance customer care. There is no email acknowledgement or receipt, and i know that the mail did not bounce.

I also called[protected] from airtel, jio and bsnl phones several times at various times of the day and on all days of the week. The number does not even get connected!

I have also sent a direct message on twitter to @reliancemobile and also mentioned them publicly. Again no response.

How can i get my deposit money back!?