Help with Configuration

I have two problems that I want to solve. 1- There is a duplicate in Radacct with acctstoptime null, knowing that I linked the free radius with the microtech. 2- Users are located in users. They have a username that matches the username in Radacct and they have an expiration date. If the expiration date has passed, I want them to be disconnected from the service with coa or without, but I tried Chatgpt solutions and they did not work. Can you help me? Thank you.