Airtel - Landline instrument not provided

I had applied for landline and wifi connection at the end of June from Airtel. The executive (Neeraj **********) had taken money from me for * months and committed that Landline instrument will be given to me along with connection next day. It has been more than two weeks and I am still waiting for my instrument and my landline to be activated. I have been following up with Neeraj regularly and he has given all false commitments to me but nothing has happened. I spoke to his boss Sandeep also but he also did the same thing (false commitment) and nothing changed. I spoke to customer care and they committed that instrument will come in ** hours and after that, someone from Airtel called me that they will not be able to provide an instrument to me. I again called up to call centre and requested executive to let me speak to someone senior and when she spoke to her senior no one agreed to speak to me. Later on, some senior executive spoke to me but no solution provided to me. He forwarded my complaint to follow up the team and then one female called me and started yelling at me as if I had done something wrong.
Very unprofessional behaviour is been experienced with all Airtel executives till now, maybe that is what train them to be rude with all customers. I feel that I have paid my hard earned money to get harassed. I have never seen such an unprofessional organization until now. If they cannot provide services so at least refund the money back to your customers.