Why buy a prescribed debt

I'm dissapointed getting calls from Debt collectors who doesn't know the prescription act. My Standardbank account has prescribed and been removed from my credit report, I called them and they advised me to contact you for a letter stating that I don't have a debt. You decided to buy a prescribed debt and now you are telling me that the account has not prescribed. I spoke to Matlou Hlongwane who's not even educated about the act, she's not even telling me facts but rather making statements that it's not her responsibility to find out if the debt is prescribed I just have to pay. I know my rights and when I requested a recording she ended up hanging the call. It is ******** to buy a prescribed debt and want to make someone pay for an account that has prescribed. My acc nr is ***B16 please email me the letter and the recording.