New Zealand Law
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On an issue like this you need to be careful about the restraint of trade clause. As a contractor, this will effectively prevent you from setting up in competition for the six-month period, and they could obtain a court injunction to stop you if necessary.
Rather than go down the path of court action which will irretrievably damage any relationship, I wonder whether you are better setting up a formal meeting with a facilitator or even a commercial mediator, at which you can discuss these issues in a confidential but frank discussion. This may seem like a more unconventional way of resolving the issues, but the options would look difficult if you had to litigate. Even if she left, and waited the six months, then the owners would likely market the patients more strongly to persuade them not to move to a new practice.
If this does not work, then you may have to leave. But unless there is a specific agreement that you be paid the $45 for each patient you attracted to the practice, you would not be able to sue under your contract for this sum. You would need to have a specific cause of action to enable you to sue for that sort of payment, based on a contract. But if you leave, you can set up your own practice but would need to be careful about the patients who you attracted to the old practice, and could not possibly be seen to be soliciting them in any way.
A verbal promise can be enforced, but the problem is always who would be believed. If the owners are vague as you describe they may may well say they didnt make any agreement, and it will come down to your word against theirs. That can be risky of course. If there are emails or letters which refer to the oral agreement that would help