This photographer asked me to do post production for one of his customers and we agreed on a price. Next thing you know, he wanted like 6-7 changes wich i did within 24 hours and i should normally charge him extra for but i didnt. I found out about those changes after I approached him. Many time a week has passed until i found out. If those changes where so important, why hasnt he approched me? His whole behaviour pattern all lead to one thing: he wanted to make it look like i didnt do a good enough job so he could try to lower the price. Unfortunately a method that happens a lot in this line of work. Now this asshole doesnt wanna pay me, completely flipping the script like it was all my fault that it took a long time til the customer got the work. I just wrote him a mail and told him to overthink his decision because this could harm his business in the city as a photographer because of how dirty he worked but i dont wanna take it there..i tried to talk to him a few times but he totally tried to flip the thing around. Any advice?