Я хочу обжаловать ошибку в начислении.

A quick breakdown:

• Я = I
• хочу = want / I want
• обжаловать = to appeal, to challenge formally, to contest
• ошибку = error / mistake in the accusative case
• в начислении = in the calculation / billing / charge assessment

So structurally, it is:

I + want + to appeal + an error + in the billing/calculation

This is a fairly formal, administrative-sounding sentence.

Because after хотеть (to want), Russian normally uses an infinitive if you want to say want to do something.

So:

• Я хочу спать = I want to sleep
• Я хочу поехать = I want to go
• Я хочу обжаловать = I want to appeal

This works very much like English want to + verb.

Because ошибка is the direct object of обжаловать.

The verb обжаловать takes a direct object in the accusative case, so:

• ошибка = nominative singular
• ошибку = accusative singular

Since ошибка is a feminine noun ending in -а, its accusative singular changes to -у:

• ошибка → ошибку

So the sentence is literally challenging the error, and that makes ошибку the correct form.

Because в here means in, and it is used with the prepositional case to show where the error is located conceptually: in the billing / in the calculation.

The noun is:

• начисление = accrual, charge calculation, billing assessment

After в in this meaning, it becomes:

• в начислении

This means something like:

• in the calculation
• in the billing
• in the assessed charge

So ошибка в начислении = an error in the billing/calculation.

Because начисление is a neuter noun ending in -ие, and nouns of this type usually take -ии in the prepositional singular.

So:

• начисление = nominative
• в начислении = prepositional

You will see the same pattern in other nouns like:

• здание → в здании
• решение → в решении
• объявление → в объявлении

So this is a normal case ending pattern, not something irregular just for this sentence.

In administrative or financial contexts, начисление usually refers to a charge, assessed amount, calculation of money owed, or an accrual.

Depending on context, ошибка в начислении could mean:

• an error in a bill
• an error in how a payment was calculated
• an incorrect charge
• an error in a salary or utility calculation

So this is not just abstract math calculation. It often appears in billing, salary, tax, housing, utility, or other bureaucratic situations.

No, they are related in idea, but they are not the same.

• обжаловать = to appeal / formally challenge
• жаловаться = to complain

So:

• Я хочу обжаловать ошибку = I want to formally contest/appeal the error
• Я хочу жаловаться на ошибку = I want to complain about the error

This is an important difference. Обжаловать sounds more official and procedural, as if you are disputing something through a formal process.

Also, the grammar is different:

• обжаловать что? → takes a direct object
• жаловаться на что? → usually uses на + accusative

Not always.

Russian often drops subject pronouns when the meaning is already clear from the verb form. Since хочу already means I want, you can say:

• Хочу обжаловать ошибку в начислении.

That sounds natural in conversation, messages, or requests.

But Я хочу обжаловать ошибку в начислении is also completely correct. Including Я can make the sentence:

• more explicit
• slightly more neutral
• a bit more emphatic, depending on context

Yes. Russian word order is more flexible than English because case endings show the grammatical roles.

The neutral word order here is:

• Я хочу обжаловать ошибку в начислении.

But you could also say:

• Ошибку в начислении я хочу обжаловать.
  This emphasizes the error in the billing.

• Обжаловать ошибку в начислении я хочу.
  This is possible, but it sounds more marked or dramatic.

So the original order is the safest and most natural for a learner.

Because Russian has no articles.

Russian does not use separate words for a, an, or the. The meaning comes from context.

So ошибку can mean:

• an error
• the error

and в начислении can mean:

• in a calculation
• in the billing
• in the charge

The exact English translation depends on the situation.

Yes, it is understandable and fairly natural, but it sounds formal and bureaucratic.

That is mainly because of words like:

• обжаловать
• начисление

These are common in official, legal, billing, and customer-service language.

In real life, depending on what exactly you mean, Russian speakers might also say:

• Я хочу оспорить начисление. = I want to dispute the charge.
• Я хочу подать жалобу на ошибку в начислении. = I want to file a complaint about a billing error.
• В начислении ошибка, я хочу её оспорить. = There is an error in the billing, and I want to dispute it.

So your sentence works well in an official context, especially if you want to sound formal.