Reliance Telecom — still sending bill as i filled form for cancellation on may 2011, & not sending security money

Address:

Nagaon, Assam

Respected sir
I Dr rajib gayan had a connection of reliance mobile No- [protected]on Feb 2011, as i have to go out of assam for roaming,
I had esed it for just 4 days only.
after then i called customer care to cancell it. but they started sending bill and goon to my house for collecting money,
I filled a form for cancellation on may 2011 in Haiborgaon reliance mobile office outlet.
The lady filled it and told me she had done all.
I paid till no nearly 1400/- rupees (exact amount dont remember as i m on net cafe right now).
But still sending bill as i filled form for cancellation on may 2011, & not sending security money
my last bill is of 800/- rs dated 11 aug 2011
kindly help me get rid of this extra headache.
i'll be grateful to you