"reject" to "major revision"

My article which has been "under review" such a long time was rejected one week ago. I believed the reviewer's comments were somehow unreasonable, and so, I wrote a letter to the editor who has been taking care of my article.

In the end, I have just received an e-mail from the editorial office, which says;

"The Editor has informed me that this decision should be reverted and you will receive a new decision letter shortly."

And the status of the article turns from "reject" to "major revision"

The editor's decision is not always 100% sure.

You should try to write a letter to your editor in some cases.