Nedbank call center agent calling and defaming people claiming they have loans

I am called often by a lady named Larato stating I have a nedbank personal loan. This is debit off my account. To my knowledge I have no accounts and no loans. She also stats I am running away from the payment related to a loan. She is calling and defaming my character stating I must make payment. When Im asking her to confirm any details even date of birth she is unable to do it. She is very arrogant and refuses to understand she seems to have no work ethics of understanding. She calls from the following number +***