Start by checking your account terms, fee tariff and statements, then list each disputed charge and why you believe it is incorrect, unauthorised or not properly disclosed. Contact the bank through its formal complaints process, provide supporting records, and ask for a written explanation and any refund or correction you believe may be appropriate. If you are unhappy with the final response, or the complaint is not resolved through the bank’s stated process, you may be able to refer it to the Financial Services and Pensions Ombudsman, subject to its rules. Check the provider’s current terms and Citizens Information or the Central Bank of Ireland for general guidance.