****ing Idiots!

Having been a client at MTN for 18 years, I think its time to move on. Around 4 years ago I transferred MTN contracts from my dad to myself. Subsequently I have done multiple upgrades on the account. The ID number for the main user is myself. MTN now claim that my dad is the account holder. Please can MTN explain how myself and my dad have same ID number?? How was I allowed to upgrade multiple times without this being an issue? The MTN debit orders are going through my account as well. My dad has nothing to do with account. I held on phone for 1 hour and 24 min to MTN. Firstly customer service agent is not willing to help me. When I asked to be transferred to the manager I was put on hold indefinitely. And now they have suspended my phone on top of all of this. Honestly once I resolve this I'm moving to another service provider.