Bajaj Finance — Consumer loan

I have taken a loan from bajaj finserv, which has been paid back. Since then i am daily getting calls/ automated calls/ sms from them for new loan. Many times i have refused for the loan and have asked them to delete my number from their records.

Taking a loan from bajaj, it seems turned out to be my biggest mistake. Is there a way to stop getting these calls.

These calls are turning out to be a nuisance and headache.