This would be no different to you ordering food in a restaurant, them bringing you the wrong meal, you refusing because you didn't order it, then they tell you to go fuck yourself and charge you for it anyway.

If this argument is valid in your judicial system then you live in a clown world capitalist dictatorship.

M$'s mistake creates no obligation to pay, either way. They cannot sue anyone for the extra money.

But some customers (depending on their legislation) might sue M$ to make broken systems running again, for example if these systems have stopped now with a 'missing license' error message.