Yeah.. Assuming you did have a verbal contact.. If it ended up in court it would be a he said/she said argument so it wouldn’t get that far, you could have the case thrown out on that basis alone.
But it sounds like even if you did have a viable verbal contract, additional pages or proof reading or whatever it it you do would technically be a breach of said contract.
You’ve given this person more than enough good will. If I’ve read correctly you didn’t even charge him for the last batch of work?
He’d just get laughed out of court if it even got that far.. As I suggested you could have the case thrown out for no basis/abuse of process before it even got to a hearing.
Just don’t deal with him any more. Tell him to file a case against you and then slam the door /phone in his face… I’d wager you’d never hear from him again.