Tata Capital — Getting too many spam calls from Tata capital even though registered in DND

My mobile number is registered in DND but still tata capital kept on calling daily many times. I have loan and closed it 5 yrs but still getting calls till date. I make no intrest in taking loan with them as they have no integrity and they charged extra during closing time and when I pointed out as per terms and conditions in their website, they immediately changed it.

How to make them stop from calling me?