Quadrant Televentures / Connectzone.in / Connect Broadband — Repeated calls and texts for non payment of bills

I have been using the services till 07/23 and then relocated to a new place, i had connected to the customer care and let them know about my relocation and asked if my wifi connection could also be relocated . Firstly they agreed to do so and when i did shift to the new place, they said they don’t provide services there(being the new place i moved to was within 1km). Then i did talk to a executive to disconnect my connection, they asked for the verification documents, i did send them and then they didn’t call me again. But now after almost more than 6 months they are giving me repeated calls and text messages to pay the bill which I haven’t been even using and now threatening me to turn legal actions to me. And i have made it clear on every single phone call they did make to me, that i had made it clear to disconnect my connection but they did not do that! So how come they hold me responsible for the negligence their staff does when i provided the documents multiple times. And now they are threatening me for the things they are wrong into.