now you print out city by-law and tell him you want to sue him at the
house tribunal,and you will with no doubt and he will pay 45 bucks if
you win.

if he is scared, make a deal with him: he gives you all money and
lets you go, you don't sue him. otherwise, sue him and leave him
a black spot in tribunal.

one thing you have to do right now, you should give him written notice
with third party witnessed.

carefully make your notes, give enough notice.

good luck!