Mtn, bad service provider

***** on my mtn account 1) sim stopped working on the 3rd dec 2020 and on the 4th I went into mtn to do a sim swop, international calls and other activities took place on the 3rd of Dec, midnight, that I cant account for 2) additional contract linked to my current cell number which I never opened, reported this 3rd Feb 2021, to find out today that the number is still active What pathetic service, all this was reported on the 3rd Feb, and up to this day nothing has been resolved. I get billing invoices upon billing invoices which I cant pay as I cant account for all the expenditure. No feedback and no investigation. ***** is a ******** defense, is this how we deal with such serious issues.