Turned me over to debt collectors without ever sending me or notifying me of account due

RE: BILL 12XSAY000032

Your turned my bill over to a debt collecting call centre (MBD) without ever contacting me in any way about the bill so I was unaware of it's existing. I phoned your call centre on 25th of April 2018 and spoke to Jeffrey Ngoetjana. He stated on recorded line that you never bothered to send me the bill or even notify me telephonically. Furthermore he said he would retract the case from MBD. In addition I then settled the account in full on 30 April 2018, emailed him proof of payment which he acknowledged per return email. On Fri 8 June 2018 I recieved another sms from MBD re outstanding account and upon phoning them they say you never retracted the account from them. When i try to email Jeffrey my emails bounce and i am informed they are deleted without being read. This is disgusting and i have a clear credit record. I want this sorted out ASAP and a written apology. Also I never want to hear from MBD ever again as I am someone who always settles my debts. Furthermore should Jeffrrey no longer be in your employ someone else should be dealing with his email account or there should be a forward to another email. Totally unacceptable.