Got a reminder because we failed to pay the origin...

Got a reminder because we failed to pay the original invoice. We paid the reminder but received a collection request. The reminder did not state the due date, but we paid within a reasonable time from the reminder date, 10 calendar days. It took a few days before we received the reminder, then it was a weekend that came in between and two days from the reminder was paid until it appeared on their account. It was thus not possible to pay faster. When I contacted customer service, they said that there is no need for a due date on the reminder, only on the collection demand. If you have not paid the day after the reminder is dated, they have at least the right to send a debt collection claim. They also charged interest twice for the same period, which was very strange. The staff said that they send to KFM even if they dispute the reminder / debt collection claim, which is a procedural error (then I also had to inform them who can / should dispute what). Then they must make a direct lawsuit to TR as the dispute is contentious. The information in their debt collection claims also contains legal inaccuracies and is only intended to intimidate unknowingly. Works himself as a lawyer with i.a. claim on which I could be critical of the customer service staff in view of their incorrect information which they provided. Will contact our supplier and present this criticism to them regarding Intrum.