Airtel — no signal on mobile phones total call drop/blanked out

I have been using airtel mobile since past 10 years and including all my family members and friends. There is a total black out of signal in this area sector 68 mohali punjab. I have complained on 14 march 2018 but no response from airtel. No team has visited. Please resolve the issue or else we will have to surrender all the numbers of airtel in this area and switch to other company. Further i am not going to pay the bill due to no service /poor service. Hope you will resolve speedily. Airtel service had no problem in past was very reliable, only now past one month this problem has been experienced