Reliance Communications — i want to convert my postpaid number allotted without my knowledge to prepaid number

Address:

500009

I was allotted postpaid connection by the reliance communication sales agent instead of prepaid wanted by me. Now i want to convert my postpaid number to prepaid. No personnel is available to answer my queries, appellate number is not working, no email is being replied to, most of the customer care centres located in my city are closed forever, head office number is inaccessible. Virtually there is no co's personnel available throughout india only ivr number is there.
Please help me to know how to do it online if possible or if any contact persons is available his number.