Double billing

How can Vodacom's Account Department not have the ability to fix problems with accounts? My husband and I have been in and out of vodacom stores and on numerous phone calls since November 2020!! My number was put on my husbands account but since last year I have been billed AS WELL. We are therefore paying double. We spoke to several people in the accounts department and they could all "see" this but they all said they couldnt do anything. I am being billed hundreds of Rands each month and no-one can sort it out? How is that possible? I am not prepared to sit on the phone for an hour waiting for someone to answer my call just to be transferred to several people within the CORRECT department but nobody able to fix it. I want a direct responsible person to speak to!!!