Airtel — vexed with airtel mnp calls

Address:

500047

Am using airtel broadband connection. Every day am getting calls from airtel customer care to convert my mobile network to airtel from vodafone.in-spite of informing am not going to opt this and don't call again and again they are calling every day and am missing some of important calls because of these people. This is happening from past 3-4 months.