When you've said that a person is ungrateful - you've said it all.
(She also said, you can be as easy as an old shoe - and worth as little.)
I am not you; I'd be LIVID at the mere suggestion that, a pro bono job which I had completed successfully had been ripped out, a Toy 'solution' fallen for.. and somehow: I AM RESPONSIBLE to do it again?
Having been in the audio business, I'm aware that there are such leeches - and guess what: often in the so-called 'Professional' class (among the least trustworthy of verbal contracts IME - MDs. We all know about lawyers). The uncivilized-grade MBA mentality appears to have spread to all levels of bizness; you'd know that quite better than I.
I would think that if you caved, without the above suggested legal dance being done, you would next, soon Hate yourself; clearly these droids are despicable. Dealing with the despicable under duress - I think we call Hell.
Luck.. but first Fight!
Ashton
probably not nearly as Nice as you are, towards the terminally ungrateful