Airtel — argument and disturbing at odd times by promotional calls

I received a call from[protected], supposedly promotion call number from airtel person at 14:03 on 26.06.14.He said that I was a valued customer and need to tell me about some scheme. I told him that I am busy in OPD (since I am a doctor) and please don't disturb me. He kept on arguing to explain me the scheme. He also went to the extent of saying that "jab paise katenge to pata chalega".I would like to look into ther professionalism of the team who are disturbing us at odd times and arguing with us and using offending language.If we are not interested to talk to them, thay should just say "thank you".