I don't  know why I was banned been playing for years, All I know is some clan member with 117 kills in pearlmarket accused me of cheating next thing i know no questions asked was banned,  I'm 55 years old only games i play is BF$ and diablo. so how do I appeal this????

Try reading the instructions. 

https://bf4db.com/forum/thread/guide-how-to-submit-an-appeal-2807