Account details not changed

I have been to the new Cell C Norkem Corner branch to take over contract that was in my mother's name. All documents were submitted yet is appears that the transfer was not done. The account is now in arrears because they are debiting the wrong bank account. The call centre is not able to assist and neither the call centre nor any other branch in the area has the contact information for this branch and it is not listed on their website. The contact information for a head office department that another branch provided me with was incorrect and the number does not exist. Please contact me urgently to resolve this issue. I live 100km away from this branch and will not go back there to resolve this query.