FNB's ************ debt collectors

My FNB credit card debt was hand over to MBD debt collectors on 5 March 2019. Since then I have paid MBD over R13,000, yet my debt has to date only decreased by R1,500. I have requested MBD for a detailed statement of account on several occasions (both written and telephonically) and have had one response which merely showed my most recent payment, and nothing else. I am clearly paying other fees and interest on this account, yet none of these fees were reflected in the "statement". On 12 December I referred a complaint to FNB about this, and was told my query would be escalated to FNB's legal department. I also wrote to FNB to say I would not be paying another instalment to MBD until I am informed exactly what I am paying for. However, I have heard nothing from Legal despite three written requests from me for follow-up. Meanwhile I am harrassed by MBD daily - telephonically (both personal and robocalls), as well as demanding and threatening letters and text messages. Shame on you, FNB, (a) for appointing such ************ debt collectors, and (b) for not taking your customer's complaints seriously. And please, FNB, let your debtors know if MBD actually complies with the requirements stipulated by the National Council for Debt Collectors, and what those requirements are.