People make honest mistakes sometimes. If the doctor's office provided an agreed service for an agreed price, then they are due the agreed payment. If they reimbursed your wife in error, then pay it back.
If you over-paid, wouldn't you expect them to refund the overpayment? Of course.
This is not litigation Lotto. You shouldn't keep the money they accidentally refunded.
Have a nice day.
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If the refund was an error, why would you be entitled to keep it? The medical office provided a service and they should be paid for that service. You are not entitled to be unjustly enriched because of an honest error.
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