Rude

I had a call from andries van tonder regarding my Truworths account at work tel phone number i asked we communicate via an email as i also work in a call center i cant take personal calls, he refused i then gave him my number to contact me on my lunch, he called and we made an arrangement whem I asked for banking details to pay he refused rudely telling me that i must give him my banking details otherwise he is going to come my work and speak to my manager regarding my account... what law is that he can come to my work to discuss my account that I acknowledged and agreed to pay I would really love him to come and he might as well fami****ize himself with the popi act while at it.... I work as debt collector and i would never speak to a debtor like that and threaten that i wil come to his place to discuss my account with my manager without a court order