If you are also hastled by every day calls from call centre of "Bajaj Finance". for Personal loans. And despite repeated requests that you should not be called and your number is within DND list with your service provider. be assured the call centre will not stop or listen to you. TRAI has for such defaulters started an SMS complaint service.
Simply follow this format. "Write the name of the company with a small subject of the call, phone number from which call came, date the call"
E.g. Bajaj Finance Personal loan, +919061*, 06-05-2017
Send this to 1909 toll free number. remember to send message within 3 days of the call. TRAI within a weeks time investigate the call and cancel the telephone number it self.
There is no other way to deal with this cheapness otherwise. You can go on blocking every number on true caller but they seem to use new numbers once they sense that they have been blocked.