Vodacom ********** extension of Contract

I went to Vodacom in Mid January 2020 to renew my data contract. I was notified that someone in Cape Town had already renewed under my name and took an IPhone (My ID is listed for ***** which means Vodacom didn't do any credit checks they would have picked that up) How do you move from paying R120 a month to an IPhone 11x and no credit checks are done ? Is that ethical ? Anyway I did all the paper work they wanted and sent this to their ***** department I have not received any feedback 3 months later and I am still being billed for this . I am getting calls every day from the Vodacom collections department but no calls or update on the ***** case . This is not good for such a big company , after so many years with Vodacom I am leaving as soon as this matter is resolved .