^In chennai maybe its possible to return the modem after 1 or 2 months.here in Mumbai,My friend returned his modem over 5 months ago and every month he has been told they will stop charging him the rent.Till date they have not been able to trace where his modem is,He got a token from the exchange saying "modem returned"But Billing section sends him to Triband section,Triband sends him back to QCS and QCS to Billing againcoz they say they have fwded the complaint to Prabhadevi head office