New Zealand provides immigrants.

It's actually a problem between schools. When your offer doesn't have a language study visa, you won't say it's a language visa.

Moreover, the deposit is generally more than 30W, and it is frozen in the bank for 3 months.

Since you haven't studied languages in the past, you must understand that you can't get a visa without paying. If you sign a contract similar to a bank in the future, this contract means that if you don't pay the money and don't handle it after two weeks, all the money you pay will come from the school. This contract is made by New Zealand for international students.