Incorrect payment report to credit bureau

My MTN account is setup via debit order on my account and this has been the case for more than 20 years.

In January 2025 my credit report indicated that MTN reported that I missed a payment for the month of December 2024. My credit rating has also gone down because of this. I am stating this categorically, I have never missed a debit order payment to MTN in my life and MTN has confirmed this when I called them. However the departments or staff who must rectify this are unreachable. I have email, called spent hours on the phone holding on but nothing. They need to rectify their mistake as it is impacting my credit score negatively. MTN sort out this problem.