goseikyuu ga aru.

It is read ごせいきゅう が ある.

• 誤請求 = ごせいきゅう
• が = ga
• ある = aru

So the whole sentence is ごせいきゅうがある.

誤請求 is made of:

• 誤 = mistake / error
• 請求 = billing / charge / claim for payment

So 誤請求 means something like:

• incorrect billing
• a mistaken charge
• a billing error

The exact English wording depends on context.

が marks the thing that exists when you use ある.

So in 誤請求がある, the structure is basically:

• 誤請求 = the erroneous charge / billing error
• が = subject marker
• ある = exists / there is

So the sentence is literally like An incorrect charge exists or There is a billing error.

This is a very common pattern in Japanese:

• 問題がある = There is a problem.
• 時間がある = There is time. / I have time.
• 可能性がある = There is a possibility.

Because 誤請求 is not a living thing.

Japanese uses:

• ある for inanimate things and abstract things
• いる for animate beings like people and animals

A billing error is an abstract thing, so ある is correct.

Examples:

• 猫がいる = There is a cat.
• お金がある = There is money.
• 問題がある = There is a problem.

Because ある does not take a direct object with を in this kind of sentence.

In English, learners sometimes want to think of this as have, but grammatically Japanese is treating it as something exists, not someone does something to something.

So:

• 誤請求がある = correct
• 誤請求をある = incorrect

The thing that exists is marked with が, not を.

Yes. It is short, but it is a complete sentence.

Japanese often leaves out information that English would normally state, such as:

• where the incorrect charge is
• whose bill it is
• whether this is a complaint, a report, or a note

So 誤請求がある can stand on its own if the context is already clear.

For example, in a customer service situation, it could mean:

• There is an incorrect charge.
• There is a billing error.
• I’ve been charged incorrectly.
  (This is less literal, but may be the natural English translation in context.)

Sometimes, yes, but the nuance changes.

• 誤請求がある = There is an incorrect charge.
• 誤請求はある = As for incorrect charges, they do exist / There are incorrect charges, at least.

が is the most neutral choice for simple existence.

は adds a topic or contrast nuance. It can sound like:

• speaking specifically about incorrect charges
• contrasting them with something else
• emphasizing that such charges exist

So for a basic statement, が is the more straightforward choice.

It is in the plain form.

That means it is neither especially rude nor especially polite by itself. It is just the dictionary-style/plain-style statement.

• Plain: 誤請求がある
• Polite: 誤請求があります

In conversation with customers, strangers, or in business situations, 誤請求があります would usually be more appropriate.

Literally, it means to exist.

So 誤請求がある literally means an incorrect charge exists.

But in English, sentences with がある are often translated in whatever way sounds natural:

• 問題がある = There is a problem. / I have a problem.
• 時間がある = There is time. / I have time.
• 誤請求がある = There is an incorrect charge. / There’s a billing error.

So the Japanese grammar is existence, even if the best English translation may sometimes sound like have.

誤請求 is a real and understandable word, and it sounds somewhat formal or administrative.

Depending on the situation, Japanese might also use other expressions, such as:

• 請求ミス = billing mistake
• 過剰請求 = overcharging / excessive charge
• 二重請求 = double billing

So 誤請求がある is natural, especially in formal writing, reports, or customer service contexts, but other expressions may be more common depending on the exact type of error.

Use:

• 誤請求があります。

That is the polite version of 誤請求がある。

You might also hear longer, more natural business-style sentences such as:

• 誤請求があります。
• 誤請求がありました。 = There was an incorrect charge.
• 請求に誤りがあります。 = There is an error in the bill.

The last one, 請求に誤りがあります, is especially natural in formal situations.