Road accident and insurance settlement

In January, he got into a minor accident. My fault, according to the insurance, I reimbursed 2500 deductible. The European protocol was drawn up. In my presence, the victim called the fear company and agreed to file a claim in the morning, and how the accident happened at night. After some time, I talked with the representatives of fear. He gave them a photo of the accident. Yesterday, I received a message that I am to blame for the 7300 company, because I did not notify them within 3 days.

I got into an accident for the first time and didn't know what else to report. Was not informed. There is no such information in my policy. How should I act?