Trai — Refund of rental advance

Address:

SF28 Block D Marutham galaxy G N MILLS POST COIMBATORE 641029

Airtel broad band connection LlL no.[protected] by Kala V ( Mob no [protected]). Rental charges paid ₹3533.84 for 6 months from 02/08/2021 to 02/02/2022.. Residence shifted to a different apartment, but Airtel broadband service not available .broad band line disconnected from 20/08/21, but charges paid for future rent not returned. Unable to contact customer care, since LL disconnected. Email to [protected]@in.airtel.com not responded. Refund status of renta charged paid in advance not known.I am helpless and have no clue how to get the refund