İster itiraz merciini arayın ister tebligatı okuyun, tebliğ tarihi değişmez.

It introduces two alternatives and says that the result is the same in either case.

So here:

• İster itiraz merciini arayın
• ister tebligatı okuyun

means roughly:

• Whether you call the authority for objections
• or read the notification

A very natural English equivalent is whether ... or .... In some contexts, it can also feel like even if you do this, even if you do that.

Formally, they look like 2nd person plural / polite imperative forms:

• arayın = call
• okuyun = read

But in this structure, they are not really being used as strong commands. After ister ... ister ..., these forms often just present possible actions in a neutral way.

So the sense is not really:

• Call the authority! Read the notice!

but rather:

• Whether you call the authority or read the notice...

This is very common in formal or written Turkish.

Because Turkish often leaves subject pronouns out when the verb already shows the person.

Here, arayın and okuyun already show that the sentence is addressing you in a plural or polite form. So adding siz would usually be unnecessary unless the speaker wanted extra emphasis.

İtiraz mercii is a legal/administrative expression.

• itiraz = objection, appeal
• mercii = authority, office, body with jurisdiction/competence

So itiraz mercii means something like:

• the authority to which an objection is made
• the appeals authority
• the competent body for objections

Then itiraz merciini is that same phrase in the accusative, because it is the direct object of arayın.

This is the kind of spelling that often surprises learners.

The legal term is itiraz mercii. When you add the accusative ending, you get itiraz merciini.

So the extra i is not random. It comes from the structure of the noun plus its ending. In other words:

• base form: mercii
• object form: merciini

It looks unusual, but it is a normal result of how this word behaves in Turkish, especially in formal/legal language.

Because both are specific direct objects, and Turkish usually marks specific direct objects with the accusative.

• itiraz merciini = the objection authority / the appeals authority
• tebligatı = the notification / the notice

Compare:

• tebligat okuyun would suggest read a notification / some notification
• tebligatı okuyun means read the notification, a specific one

So the endings help show definiteness/specificity.

They are related, but they are not exactly the same.

• tebligat often refers to the notice/document or the formal service of a notice
• tebliğ refers more to the act of notifying/serving or the legal fact of notification

So in this sentence:

• tebligatı okuyun = read the notice/document
• tebliğ tarihi = the date of notification/service

This difference is especially common in legal Turkish.

Tebliğ tarihi is a standard Turkish noun compound, especially in official and legal language.

It works like:

• tebliğ tarihi = notification date / date of service

This type of compound is very common in Turkish. The first noun does not need the genitive ending.

If you said tebliğin tarihi, that would sound more like the date of the notification, referring more explicitly to a particular notification. Grammatically possible in some contexts, but tebliğ tarihi is the normal fixed expression here.

Değişmez is the aorist/simple present form of değişmek.

Here it expresses a general rule or legal principle:

• tebliğ tarihi değişmez = the date of notification does not change

This use of the aorist is very common in formal statements, rules, and laws.

It is different from:

• değişmiyor = is not changing, is not changing right now
• değişmeyecek = will not change

In this sentence, değişmez sounds the most natural because it states a standing rule.

Yes.

Turkish normally puts the verb at the end of its clause, and direct objects usually come before the verb.

So these parts are very normal:

• itiraz merciini arayın
• tebligatı okuyun
• tebliğ tarihi değişmez

The overall structure is:

• alternative 1
• alternative 2
• final result

So the sentence flows as:

• Whether you do X or do Y, the result remains the same.

Yes, very formal, and especially legal/administrative.

Words like these are strong clues:

• itiraz mercii
• tebligat
• tebliğ tarihi

A native speaker would immediately recognize this as the kind of language used in official notices, regulations, court documents, or government communication, not everyday conversation.