Finchoice claimed I still owed even though I settled

******!!! I settled my account last year in September and even sent their collections department my proof of payment, after a month they finally allocated the payment to my profile and my balance showed R0 on the statement. This year in August I start getting phone calls from a collection agency! (MBD Collections) calling on behalf of Finchoice, telling me that I owed finchoice money. I called finchoice countless times wanting to query this and asking them to put me through to their legal department but their phone kept getting disconnected. I finally Google their email address sent the proof of payment again along with the settlement quote,only for them to reply saying that they have handed over my account to a third party and on top of that gave me the wrong contact details. I had to sit and wait for these people to call me again so I can request an email address to forward the proof of payment. And even after confirmation they that they received my email they still wanted me to acknowledge the debt. So thanks to finchoice I was harassed for an entire month