Bajaj Finance — persistent nuisance calls from bajaj finance

Repeated phone calls from bajaj finance, some time 3-5 times a day, each call from a different mobile number, even after registering in their dnd register. Today i received calls from ‭‭+[protected]‬
+[protected]‬ and ‭+[protected]‬. Every time when i informed them that i do bot need any of their services and requested to stop calling, the caller assures that he/she will remove my mobile number from their system but in vain. Their calls have become a real menace in routine life. While on an important meeting or sleeping or engaged in some serious work at office or home, these calls come and make undue disturbances. Since the calls are from a different number every time, blocking the number is not a solution at all.