*****ilent local calls made on MTN cell phone

I live outside of South Africa, but keep my MTN number for banking etc. Since mid-year 2023 local calls (Calls made in SA to SA numbers) have been billed to my account, I couldn't make these calls because I reside in Chile. I used *** to lodge my complaint. What disappoints me is how I get treated by them. Even if I refer back to previous complaints the first line from MTN is that I need to prove who I am etc. After this, I finally get the complaint in, and then I get the assistance reference number and never hear from them again. The following month there are more bills for local calls I could not have made because I am overseas. Then when I complain again and get ignored again after I got an ref number.

This cycle repeats, but the real issue never gets resolved.

What really concerns me is how is it possible that local calls are made and billed to my account while I am not even in SA. I lost complete trust in MTN's billing system.