South Africa Law
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Please see my comments on the previous question.
As far as the criminal charges relates to Jane, there seems to be enough evidence to substantiate all of them (except a protection order and interdict is not a criminal charge). John could face crimen injuria and perjury charges as well.
The Civil claims will on the one hand be calculated by actual damages such as actual damages and costs of repair, actual loss of income. Future loss of income and potential loss of workplace will have to be substantiated by evidence and will have to be calculated by an actuary to carry any weight. Defamation or the spreading of injurious falsehoods will depend on your standing in the community and recent court decisions in similar circumstances. There are no fixed amounts and each case is determined on its own merits. your attorney will be suited to advise you on the quantum. The same applies to the general damages.
As mentioned before, Crimen injuria and perjury charges against John should succeed. The manipulation charge in my opinion will not succeed. You should be able to get a protection order, and you should be able to claim damages for false imprisonment. The same civil claims as against Jane can also be made against John, except those that relate to the assault and damage to property.
My apologies for only reverting now. I've just had a hectic day and no earlier opportunity to revert arose.
With intimidation there needs to be a threat to make someone fear for injury or other harm.
I don't think the lawyer's letter would constitute extortion or blackmail. There has to be more direct evidence, in other words if the lawyer's letter said that Jane would withdraw the charges if you pay a certain amount, that could amount to extortion.