[Resolved]  BSNL NIC CARD Internet connection — REFUND OF DEPOSIT NOT OBTAINED, Worst customer care

I had submitted an application for closure of my net connection( NIC CARD from BSNL), submitting all documents and instrument. within two months I should have got my deposit by check by mail, but till date I have not received anything. On top of all, they are sending bills for following months, which I have not used at all. So many times I have gone for enquiry to BSNL office in Ahmedabad. Those very lazy fellows don't give response, they don't take any application seriously into consideration. Tell me what should I do please.