***** account open by Vodacom

My mom had an account with Vodacom that i paid till December 2017. Someone at Vodacom then opened another account on her name with my Bank Details and another number. Since January 2018 i have been trying to stop this payment as i have to pay for it every month. No one can tell me who opened this account and i pay for something i dont have. I have been trying now for over a month after all documents was emailed to Vodacom Legal. Today, 23 April 2018 i have been on the phone for more than 30 min to try and speak to someone. How can Vodacom open an account and not one person at Vodacom can tell us who or why this is opened and another number. Then they use my business bank details for monthly payments. This is really bad and the response from Vodacom is not happening at all.