Capitec bank - Vultures!!!!

Hi, Forgive me if I do not remember the details clearly, but this happened over 12 years ago. I had a Capitec account in 2006 and I closed it. Apparently, my boyfriend of then, made a loan at Capitec on my name and someone at the bank helped him to commit *****. The reason I know this is because my ex admitted this a few years back after I confronted him about it. He was on drugs and took a loan without my knowledge. I did not know about this loan and only found out about it after I was garnished. I even made an affidavit that I was not the one to loan this money, but the garnish was served and the money was deducted from my salary for two years. I actually paid more then I should and I was reimbursed and received a paid up letter. I started paying in 2013 untill 2015 when they paid me back R1200. Great was my surprise when a Barbara lady phoned me about a year later and explained to me that I owe Capitec money. I mailed the paid up letter to her and I explained to her as well that even if there was another account it was older then 3 years and was obviously the debt was prescribed. She told me it was another loan. I was not aware of this and no one contacted me in connection with it and I was garnished for an amount. How do I even know that there was two loans and does Capitec even allow two loans at one time? Surely this is absurd! She never contacted me again. Now, from last year Daly Credit is phoning me constantly about this and even after I mailed them the proof of payment and explained that I was refunded the extra money that was deducted in error. What the hell must I do to get these vultures of my back? I already paid them R6058 which I never even borrowed and they wont leave me alone.