Unacceptable service

I have been charged for two contracts when I only have one. Multiple (dozens) of phone calls, multiple (dozens) of emails, and multiple (dozens) of visits to the store in question (with multiple reference numbers provide) have produced no response (other than more reference numbers and suggestions to contact someone else... in what seems is a never-ending circle of failure to accept responsibility). This began when I was issued a new phone with a new number on the 17th of December 2020, IN SPITE OF STATING REPEATEDLY THAT I WANTED MY EXISTING NUMBER TRANSFERRED. I waited patiently while my WhatsApp was transferred to the new phone (which was given my existing number) and I showed them my broken existing phone, so it was very clear that I wanted my existing number on a new phone. Since I don't use phone calls much (I use WhatsApp frequently) it took a few days before I called someone and they asked me what this new number was. On the 21st of December 2020 I went back into the store, and was assured it would be simple to cancel the incorrect number, load my pre-existing number on THE ONLY PHONE THEY GAVE ME and charge me pro-rata. Instead, I have been charged for two phones, two contracts and it seems no one at MTN is willing to respond to multiple (MULTIPLE) emails and store visits (La Lucia, Durban) other than to suggest it will be sorted out in a few days (which, clearly it isn't). The incompetence and indifference of MTN and their client services is staggering.