Absolute Disgussed In Corporate SA

I had a business for 23 years and Standard bank was my bank that i used for my business, my home and my insurance. Unfortunately my marriage fell apart and we had to dissolve the business in 2018. When I approached Standard Bank in Durban North KZN I was given a full and final settlement of R54000.00 to settle all outstanding amounts which I did. 2022 to my horror I start receiving threatening calls from MBD Collections telling me Standard Bank sold their outstanding debt for collection. Please note I had no contact with Standard Bank for 3 years but I was handed over. I received a summons stuck in my gate demanding R42k+ for what no one can tell me all they say is that this account was closed in 2021. Since my ugly divorce and division of assets that were sold without my knowledge I took the little I walked away with and settled the bank. I started using FNB in 2019. So to be summoned and called like stalkers by MBD Collection 5 times on a Sunday not to mention others days I am humiliated and disgusted by the non professionalism of the above mentioned. Consumer law states if I dont receive and communication from debtor or if I don't acknowledge the so called 3 years old debt then its considered debt prescribed. The summons received all information on Standard Bank is blacked out all thats on the summons is Munnik, Basson, Dagma (MBD)Incorporated attorneys. No signature of Standard bank no hand over amount all blacked out. Is this what we are reduced to gangster collections. I am appalled and disgusted.