Incorrect payment history provided to credit bureaus

Due to vodacom account department providing the credit bureaus the incorrect payment history I'm having it reflecting negatively on my credit report now. My account has never been suspended or canceled and I always had payment arrangement in place if and when there was a problem regarding payment. I did my part but still I must have this incorrect payment history on my credit report. I have emailed numerous times to have this amended accordingly but with no response. Very frustrated and unhappy customer.