MTN's billing system is faulty

MTN's billing system is faulty. I have roaming charges on my account. Despite reporting it to MTN last year in October already, you have done nothing to fix it. How is it possible that I have roaming charges on my account and I have not even been outside the borders of SA since 2018!!!!! And even after reporting it, you denied that there are roaming charges, yet I can see the roaming charges on my account. The level of incompetence at MTN is a disgrace.