Account settled but still reflects on Credit beureau

I had a debt with Direct Axis which I decided to settle on the 16th of June 2016 with Easton-Berry. I submitted the proof of payment as they required me to the following day. I then e-mailed Mr Philemon Dibobo who was in charge of the account as I was informed, requesting a paid up letter. He promised to send it to me straight away. I tried to make follow-up correspondence to no avail,I just got no response from this guy. 7 months later I still get phone calls from a different collections agency regarding the account, and it still reflects on the Beaureau as unpaid. The last email I sent to Mr Dibobo was on the 17/1/2018, and he promised to send me the paid up letter, which he never did. Extremely disappointed with Mr Dibobo's unprofessionalism, just disgusted.