NEVER attempt to change a date with Vodacom!!!!!

I phoned Vodacom (111) on 22/09/2015 requesting to change my debit order date to the 15th (from the 1st). Everything on that call went well and I even confirmed that the next payment date will be on the 15th, which I was told was correct. Today I received a call that my account is in arrears and that my lines will be cut off in the 9th if I do not make a payment (which I understood should have been debited on the 15th. After 16 minutes on the on the phone struggling to explain my problem, I was transferred to accounts department. They informed me that I should have made a manual payment on the first for a month's access and that my account will again be debited on the 15th for a full month's access. That was a call of 28minutes and 48 second in total!! Two months premiums must be paid in one month if you change your debit order date?? Ridiculous!!! I have all the recordings of the calls made and listened to the call of the 22nd of September and guess what, no mention of the manual payment. I am truly disgusted. I have been a Vodacom customer for some time and cannot believe that something like this can happen!!!