I listed used book as new

I have made a huge mistake and I got complaint from Amazon itself, my account got closed due to section 3. amazon is asking me to prove them that book is authentic and they are asking for invoice.

I got the book from some friend who sells pallets of donated books.

the book is self improvement book, very thin. independent publisher, it sells only on author’s website and amazon’s website. and it is best seller.

I need help if someone’s advice or any help gets me out from this hell I will come to his state and going to be his slave for a day.