charge for something that is your own error

I would just like to raise the fact that whilst vodacom is responsible for switching my debit order too early, they are now charging me for their own faults. My bank account has changed and vodacom has changed it to early resulting in the debit order being returned, payment was effected to them immediately after checking with my new bank that vodacom has not advised them that they had changed details. I would like vodacom to reverse their penalty as I do not think I should be paying for this. I have just tried to contact the call centre and had the phone put down on me