Airtel — DTH service recharge related

Dear Sirs, I am using airtel dth 2 connections @ 2 different location, but due to unavoidable situation I cant use 1 of the connections so I have not recharged the same. But this airtel guys call me frequently to recharge, they also threaten me to take action in case if you not recharge or surrender. One of the guy also misguided me to recharge of amnt 210/- and you connection will be active for 6 months and no call from airtel during that period. So I have done the same but then after a month the call flow begins actually they get recharged it for 1 month according to my plan without any use. Even I dont know that settop box is airtel property bcoz during purchase they have not informed it and they have charged me for settop box while purchase. Now kindly suggest the way what should I do.