changing direct debit accounts and still block phn

about a week ago, called vodacom to change my bank details of direct debit to another banking details. I clearly asked the person ARE YOU SURE IT WILL COME OUT OF THIS NEW BANKING ACCOUNT THIS MONTH AND I NOT BE CHARGED WITH LATE PAYMENTS AS THIS WILL AFFECT MY CREDIT SCORE AS I WAS ALSO TOLD BY THAT PERSON IM DUE A UPGRADE ON THIS ACCOUNT IN 1 WEEKS TIME!!!! HENCE I HAVE 2 ACCOUNTS WITH VODASKOM.yes Sir dont worry. fantastic. go into Canal walk to go see a new phone, all excited for them to say sorry sir you can theres a black mark on your account for late payment and also to tell you we are cutting off your phone till its paid. called vodacom, they said they already sent all the direct banking to the banks and that I was late to change my banking details. Right, its the customers fault once again as I should of known that and not the person whos in the accounts dept that works there. So still no new phone, well i can get one, worse than the one I have, my current phone is still offline, and still paying off 2 accounts with vodacom. especially when I went into the store not knowing all this, been shown a great Samsung phone and then NO WAIT SORRY SIR YOU LATE ON PAYMENTS. cellC