My New Nintendo 3DS have some several problems

I bought a 3DS from a guy from online and he told me that he is in great condition. But when i turn it on i spotted several issues.
1: Home button is not working
2: Microphone is not working
3: Control pad is not under control
4: Circle pad is not working

So im asking you to help me. I wish if i can ship to you and try to fix it. I dont ask for a price.

I hope for your answer.