Incorrect billing

I have been calling customer service to get an answer as to why am I paying a penalty fee for debit order that was not collected on the right bank account that I provided when I opened the contract. No one is willing to assist me I keep on getting promises to every consultant I speak to that a team leader will get back to me, till now. Please refund me the money that you unfairly charged me its not my fault that your system or consultants cannot update client's details.