Reliance Netconnect Data Card — Unwanted subscription of Rs 330 Prepaid plan

I am Samarth Vyas living in VALSAD. I am a user of Reliance Netconnect which I purchased from Valsad Reliance Webworld and I had faced many but small problems before. But this time they almost robbed me.
I have a habit of paying the bill of netconnect by going at Reliance office as the bill reaches at the address late many times. Suddenly few months back my bill was Rs 730. I asked at the office, they said you must have used. Next month it happened the same. But on the third month I was out of town and I didn't use it. but the bill was still the same. Then I came to know they started a 330 Rs prepaid mobile plan on my netconnect . I was shocked. When I asked for clarification they said its a mistake and they assured me a waiver within a month. But they gave me a waiver of 700 out of 1100 and that too after repeated complaints of 4 months. Still they haven't paid me back my Rs 300 and they have barred my service for non payments of bills.
I have got fed up from Reliance services . I don't know when they will stop playing with customers.