You must raise your objection in writing or in writing. If possible, you should use the term "objection" in your letter.
Opposition
By filing an objection, you initiate the opposition procedure. In this case, the decision of the authority is re-examined for its legality and expediency. Your justification for the objection will also be taken into account, as new facts may arise that were previously unknown to the authority. It is therefore advisable to give reasons for the objection.
If the authority concludes that the objection is well-founded, it will annul the initial decision and, if necessary, take a new decision. This depends on whether you only want the administrative act to be repealed (challenge) or whether you also want another decision (obligation) from the authority. Your objection will be remedied.
If, on the other hand, the authority considers your objection to be unfounded, it either rejects it itself as the appeal authority by means of a notice of objection or hands it over to another competent authority for a decision. This appeal authority will then examine the matter and make the decision on the rejection or granting of your objection by means of a notice of appeal. Whether the originating authority itself or another appeal authority is responsible for issuing the notice of opposition is regulated by law and depends on the respective legal matter.