Airtel — harassment by the airtel dth customer care executives

I am an existing costumer of airtel dth. I requested for a second connection. However this is a matter of concern that the so called costumer care executives are harrassing me in a rude and unbearable language. Even he used the words like deaf to me. My question is who permitted the so rude persons to behave like this to costumers. Is airtel endorsing such things... I received the call from [protected]. Request to address the issue.
Regards
Akhila satapathy