Reliance Postpaid Connection — non refund of security deposit

I had reliance post paid connection -phone no -[protected]. On 23rd June 2008, I paid Rs 780 and asked for service termination. I submitted the service termination request form on 30th June 2008 and was told to pay Rs 280 for the blll till date of service termination. I paid the amount (receipt no S[protected] and also the termination request.
I waited for about two months for refund of security deposit but did not get any money. On making compliant to Reliance communication, (Service request ID[protected], I was told to pay Rs 575 more which, according to them is outstanding in my name.

Issues -- I paid the full amount till the date of termination but never got back the security deposit. The company never provided me bills for the above two payments and neither for the amount of Rs 575 claimed from me. Even if the amount is due from me (which is not the case ) the company should have refunded the security deposit after adjusting the so called dues.