Useless customer service to change banking details

At the beginning of November I tried for 12 days to change my bank details for my contract debit order to go through on the new info!!!! No luck. I then happened to phone 135 one morning and within the hour the back office Estelle rang me and it was sorted. Only the back office can do it!! This time I have new info again due to ***** and I was told 1 hr to 24hrs for a call back. 24 hours has come and gone and now I am told 10 to 14 days. I am going to hospital tomorrow and cannot get this sorted. What do Vodacom expect customers to do as I will not give my info to the call center as last time nothing happened and Estelle said the NO ONE ELSE CAN DO IT. HELP!!!!!!