How do you defend against TA proctor false accusation of "seeing you look at others computer screen" to cheat on final
I think the evidence is weak unless you were extremely obvious about looking at other screens. Matching answers is almost never evidence of wrongdoing. In fact, matching incorrect answers can be evidence of poor question statements. And matching correct answers is just evidence of knowledge gained. 

I would state what you have here. I didn't cheat. I had no need to cheat. I finished early. The proctor was simply mistaken. 

Part of the problem in such situations is that no matter what we are doing or thinking, unless we have closed our eyes, they point somewhere. It is easy to misinterpret a look. 

And a five month delay before being informed seems to be disqualifying to me. Presumably the proctor didn't have enough "evidence" to call you on it during the exam. 

Sadly, no one can guarantee fair treatment in such cases.