Generally, the answer is no. A prior formal notice is required by law only in some specific cases. For example, when a seller wishes to cancel the sale of a real estate property, the latter must send a formal notice to the buyer.
Although in most cases the formal notice is not required, the fact remains that it is a very important document. If your dispute were to end up in Court, having sent a consistent formal notice before the proceedings could help prove your good faith. A formal notice generally reflects your intention and will to resolve the situation with the other party before applying to Court.
If you are not sure about whether or not you are required to send a formal notice to protect the exercise of your rights, it is better to send it anyway or, better yet, consult with a legal professional who will be able to advise you on this matter.
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