Bajaj Finserv — Telemarketing calls

I'm from Bangalore, i'd purchased few electronic goods through Bajaj Finserv. my problem now is i'm getting frequent automated/manual calls from Bajaj Finserv alomost 4 to 5 times a day, the same call and the same subject on low interest loans ! these automated calls are coming irrespective of times and also all the days including holidays !, I would like to point out that i'm working in multimedia industry audio recording and things... and mostly i'll be in online meetings, these calls are really disturbing me a lot and sometimes more and more irritating, i am not in the condition of purchasing any loan from you and i'm not interested at all, i had registered on TRAI DND registry and requested one of Bajaj customer care personal to delete my data from thier system but so far no help... It will be a great relief for me and my career. Please understand my situation and help.