Credit score affected by incorrect information

I had a debit issue previously, however, I received a call from someone advising that the error was on Vodacom and that the matter is now finalised as there will not be any further debits. However this morning when I checked my credit record on Clear Score, I noticed that Vodacom is now listed as an account which I have missed payments on. This has subsequently led to my score dropping significantly and being negatively affected. I would like to request that you please rectify this with the relevant institutions to rectify and reverse the negative impact on my credit history. I would therefore like for Vodacom to erase this mistake so that the Vodacom missed premiums that was never my failure to begin with, does not reflect on my credit record.