Misleading

I request a change of my debit order date from the 25th to the 1st of each month due to affordability and my salary date, the service went in breached the request for change and debited my account on the 25th and 6 days later debited again on the 1st , the consultant I just spoke to first agreed they were not meant to debit on the 25th as I requested a change and that there was an error and later changed and advised that It is a policy when you change the date to a double debits (which is not stipulated in their policies) I would have not done the change and continued to make late changes if I knew this ... safe to say after this month I am definitely moving to a reputable company that understand pro ratas.