Aircel — Harassment even after paying the final settlement

Address:

Chennai, Tamil Nadu

Dear Sir, I have disconnected my mobile connection with Aircel([protected]) on 15/07/13 and paid my final settlement amount too in the same month billing cycle date. After that I stopped using the number too. Even after my disconnection they are going on generating bills for every month. If I mail to there billing team regarding why they are generating bills even after my disconnection, I didn't received any response from that company. And today (21/04/14) they are calling and saying that if you don't pay the bill amount Rupees 1900, then we will file a case in Delhi high court. And also saying that if we file a case in Delhi high court we will collect the fine amount of Rupees 28, 000 But i'm having all proofs with me. Please help in this.