Bad credit report because of Vodacom

I have had a data account with Vodacom which ended after excessive accounts were received. A dispute about ridiculous charges of thousands of rands per month followed after which an agreement was reached to cancel the contract and the outstanding amount had to be paid in installments. These installments have been made since December 2014. After recently receiving my latest credit report NONE of these payments reflects on the report and the score is deteriorating monthly because these payments do not show. After enquiring about this Vodacom informed me that it will only be updated once the full amount is paid. I think this is totally unfair because it is not a reflection of payments made towards the account and it gives me a bad credit report which will take months to recover. I am extremely dissatisfied by the service provided by Vodacom -firstly you get excessive bills without any warning and secondly payments made towards accounts do not reflect on a credit report. I need the payments made up to date to be reflected on the credit report ASAP otherwise I will take this matter further!! This is absolutely ridiculous!