My recipes all say to add the vinegar BEFORE you heat it up? Hmmm...what recipe did you use? Do you mean cottage cheese? Does the recipe call for rennet? (None of my recipes say to scald/simmer). It sounds like you got that milk really hot.
I would just leave that pot to sit undisturbed in a nice warm place and see what happens in 12 to18 hours. It may set up after all. If it doesn't then feed it to the chickens/pigs/dogs and start again.
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