[Resolved]  IPTV - MTNL - AKSH — Non-refund of refundable deposit

Address:

Mumbai City, Maharashtra

I had surrendered IPTV connection in February 2010 and till date the company has not returned my refundable deposit. Till last month,at least 6 times I received calls from Aksh-office and twice from MTNL (North),Wadala exchange but the money was not returned.
Last week I sent one letter to MD,MTNL, New Delhi under copy to GM, Wadala,MTNL and explained that this connection was taken only because MTNL advertised it and hence they must help me get my deposit. Since there is a delay of one year I have demanded interest @10% on my deposit.
Today I received three calls from[protected] {Aksh-IPTV,Mumbai} but they declined to give me interest.
If a consumer delays payment even by a day,these agencies demand and levy penalty.In my case I have waited for one full year and yet,they are reluctant to pay interest.
Am I wrong in claiming interest?