My unwarranted woes with TFG

TFG have a strict policy on collections from their account holders. Their due date for account payments is strictly first day of the month, by midday the second day an sms notification is sent. If no reaction stern communication comes about debt collection and the customer's liability for attendant charges. All well! I then decided on a debit order and we agreed the 7th of each month. The sms came, then the stern messages, but it was hardly the 5th of the month! I called the number provided. A self-righteous sister on the other side of the line was uncompromising, she was not prepared to take any explanation. In summary I was an errant customer, and the explanation was just a ruse. Despite successful debits for 2-3 consecutive months , I kept receiving the end-of-month sms, and the stern notices until the debit date. In my monthly statement, I see a charge for the sms, despite that it is unjustified. It looks like now the incongruity has been fixed,but while it lasted it was more than a nuisance. I just wonder what their report about my credit behaviour was to the credit bureau, I learn such things get reported; if so will they bother to make amendments, or they will leave the false information, to inform my credit status to other credit providers. My conclusion from this experience is that the collections department was over-enthusiastic, when I informed them about the debit order, they should have checked with the relevant department whether this is so or not. They chose instead to ********ise me, for "failing " to comply with their first day of the month collection policy. Later, I regretted my practice of not listening when the company call centre personnel introduce themselves, I could have taken this matter up by escalating it within the company, but I would not have been able to help them trace this irresponsible sister.