Bad service

I called vodacom two woeeks back and ask them to change my banking details. The consultant conform to me that she changed them. On 25 of November vodacom did not debit, I call them to find out why and the consultant confirm that the money was debited on the 25t.. and i told her that but on my side there is no transaction about vodacom debit orde. Then she said i must go to my bank to check with them because on vodacom side it shows that money was debited. Then again I receceive message saying i didnt pay. I call them again and i ask consultant which bank is it appearing on her system. She confirm the bank details that i told them to update. Then i tell her that i am receiving sms saying i didnt pay. She transfered me to accounts department were i was told that my details were not updated and he tell me that I am charged R100 for not paying. I ask him to go and listen to all conversation i had with previous consultant who gave me false information and say everything is fine, if vodacom didnt debit is not my fault, i became honest and make follow up two times knowing that i have seen that debit order didnt go through. But all they say is everything was fine. I told the consultant at the accounts department with the name called Vhuthu, to load a debit order immediately for the amount that was suppose to be debited, he told me he cant unless if i wait until monday. So yesterday still the money was not debited even today. Only to find out that when i call again vodacom has charged me again and the next debit order is double the amount yet there is money in my account and they are not taking it. Is this fair to be pernalised for things thta are not your fault?