Unable to close Deceased account

I contacted the call centre in april to cancel my deceased mother's account. I was given instructions on what documents were required and to send them to ***. I sent all necessary documentation on 25th April. I got no response. I attempted to follow up on 4th may, no response. I went into my closest vodacom store today to try and resolve with a person. I was told they could not help me and directed me to contact the call centre. I phoned the call centre, and I was told to go back to the store...... And while this all happens, the account is being debited every month