Bajaj Finance — Unwanted calls from Tele Callers

I am getting calls repeatedly, sometimes more than once in a day to sell your loans to me . I have requested number of times to the callers to put me in the Do Not Disturb list for tele callers but it is not happening. I would like to know why this constant harassement is happening . I had taken loan in 2017 from Bajaj Finance, is it crime to take loan from you ? Does it give you right to constantly harass person for the entire life ??
I would like to again request to put me in the Do Not Disturb list for tele calling.