Just listened to Frachis segment and...
..while he IS right and I completely agree with him on the topic itself, I wouldn't call it "we worked it out" when he insisted that everything stays the way it is and get an official apology or he'll throw the towel.
If this was a "regulary paid" job you're no artist, you're a paid craftsmen that is supposed to deliver something the customer wants you to.
Of course I don't know the exact circumstances, like if you just did it without proper contract or pocket money things look way different.