Unfair listing at Credit Bureau - VODACOM not accountable

I received a settlement letter from VODACOM on 21 Nov 2017 in which they decided to pay outstanding amount that I was allegedly owing them. The letter stated that it may take up to 7 days for credit bureau to update their records. 7 days have come and gone. My negative credit history is still reflecting and nothing was done. nobody follows up with credit bureau to check if this was removed.