Airtel — not able to connect calls easily

Address:

Bangalore, Karnataka, 560054

I am using Airtel from last 2 years now. But from past 2 months, when i am trying to call my home on any other number like Idea or something, everything it says “All channels are currently busy”. This keeps on happening for 15-20 times and at last I couldn’t make calls. But whenever i will dial from another mobile or number, it will get connected. I raised a complaint to Airtel’s customer care also but they say everything is fine. I don’t know what to do. There’s something wrong with Airtel. Why are they doing this??..i have got tired of facing the same issue. Please help me.