Low risk orders suspicious

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some days ago I have a lot of orders marked as high risk fraud and medium risk fraud. Mainly these orders were from America Latina and some from USA. In this case I first sent an email to each customer without response. I tried to call them and some of their respond me and sent me an email with their ID card and last four digits of credit card(there were all fraudulent).
So now I have some remaining orders that as marked as low risk fraud. But these orders were placed during the days that I’ve got a lot of high risk orders. Now I tried to check every single order and for example I looked that the same customer paid with different credit card. I tried to contact them without any success. But this order has marked as low risk. What I have to do in this case?