I was recently offered a job in which I was sought out as a candidate and I hadn't originally applied for the position. At this time I was made aware of a salary I was not interested in, and in the interest of everyone's time I expressed that I made a salary of $X and would not be interested in leaving unless the salary was noticeably higher.
I realize this is not how these things are typically done (first time for me).
Anyhow I was asked to come in for the interview after having expressed this request and was subsequently offered a salary of exactly $X. While on the phone with HR I expressed that the salary requirements I had put on my application ($x + 20) reflected what I was hoping to get given the difference in benefits however I would be willing to negotiate for additional vacation time etc.
They came back to me stating flat out they are "unable to be flexible on salary or vacation time".
Does this mean my offer is a final offer and I should make my decision accordingly or should I write a formal counter offer?