This was forwarded to me by a friend in another law firm who received it from opposing counsel in one of their cases. I understand some words are confusing, but if you struggle, take the time to learn them. Accept means to take or to receive and except means to exclude. So effectively what the attorney is saying in this letter is that his client will exclude the offer, which I would take to mean he did not want to accept it. Somehow, I don’t think that is what the attorney had in mind.