Dispute with MBD Attorneys

I received an SMS from MBD Attorneys on 30/11/18 regarding my outstanding RCS account for +-R12 000. The account number quoted on the SMS is also not my account number. I telephoned their offices to inform them that I do not have an outstanding account with RCS. I was told to contact RCS directly and get a "paid up letter". This I have done and forwarded the paid up letter to MBD via email on 04/12/18 requesting that they respond to my email to ensure that the problem had been sorted out. RCS also had no record of the account number that was quoted on the SMS message! No response has been received from MBD. I have emailed again on 06/12/18 and 07/12/18 and still no response. Today (11/12/18) I telephoned MBD offices and asked to speak to a supervisor or manager and was told that "my supervisor is refusing to come to the phone". I asked for a manager and was told that they cannot transfer calls as they are a call centre. How do I contact someone in the company that will actually do something about my complaint. FIrstly -the account number that MBD quote is not my account number and secondly I have not had an RCS account for +- 3 years (and it is paid up). An emailed letter received from MBD recommends a 6 month debit order plan to pay off the account in order to in order : * to prevent the unnecessary route of legal proceedings; * to improve your credit profile; * a step in the right direction to clear this debt.

My question is - if you don't attend to my query and dispute of this account are you going to list me on the credit bureau and institute legal proceedings???

Someone please answer my query!! This is totally unacceptable. You are very quick to send out SMS messages and emails but very lack in responding to correspondence sent to yourselves. Shocking service to say the least.